Basic start date is getting changed in WBS

[sunil_yadav2]

Hi,

i have a scenario where i am using forward schedulling for Network and backward schedulling for Wbs.

now basic start and finish date are coming correctly but when we schedule/auto schedule this project WBS dates getting finish date or Network as start and finish date.

Network dates: Forward Schedulling

WBS dates: strictly bottom up (Backward Schedulling)

Project Date:Free scheduling

Please suggest why this is happening.

thanks

Sunil

[sunil_yadav2]

Hello Experts,

Please guide me for scheduling.

Currently when a activity get confirmed than system is ignoring that as below Example:

Object     Start date          Finish Date

WBS 1

Network 1

Activity 1      01.02.2015     03.02.2015

Activity 2      04.02.2015     05.02.2015    

Activity 3      06.02.2015     07.02.2015

after scheduling

Object     Start date          Finish Date

WBS 1     01.02.2015     07.02.2015

Network 1     01.02.2015     07.02.2015

Activity 1      01.02.2015     03.02.2015

Activity 2      04.02.2015     05.02.2015    

Activity 3      06.02.2015     07.02.2015

now confirm activity 1 on same dates

so system should show dates for WBS and Network as same

but System shows

Object     Start date          Finish Date

WBS 1     04.02.2015     07.02.2015

Network 1     04.02.2015     07.02.2015

Activity 1      01.02.2015     03.02.2015     (Confirmed)

Activity 2      04.02.2015     05.02.2015    

Activity 3      06.02.2015     07.02.2015

Please suggest why this is happening.

thanks

Sunil

[MTerence]

Hi,

What are the scheduling parameters you are using ?

Regards

Terence

[sunil_yadav2]

Hi Maria,

Backward Schedule for WBS and Forward for Networks & both with adjust basic dates

scheduling method as network determine dates.

thanks

Sunil

[MTerence]

Hi Sunil,

Are you using Bottom up planning in WBS element date scheduling ?

Also change the schedule parameter not to adjust with basic dates.

Regards

Terence

[sunil_yadav2]

Hi Maria,

i am using strictly bottom up planning.

thanks

Sunil

[MTerence]

Hi Sunil,

Change your config in OPU6, not to adjust basic dates with operation dates, i suspect, since this setting and backward WBS scheduling.

I am not sure, but you need to adjust the config in OPU6 and check it.

Regards

Terence

[sunil_yadav2]

Hi Maria,

while creating project my selections are :

this is taking dates and changing basic dates for WBS and project even selecting dates from non confirmed activities only.

now i am changing

now my dates are coming correctly

my question is what is basic difference in bottom up and strictly bottom up scheduling?

strictly bottom up scheduling does not takes dates from confirmed activities. why?

thanks

Sunil

[MTerence]

Hi Sunil,

As of from SAP Help.

• In Bottom Up Planning you  plan the dates starting from the subordinate WBS elements. The dates of the superior WBS elements are only changed, if they do not include the dates of the subordinate WBS elements
• In Strict Bottom Up Planning you specify that the dates of subordinate WBS elements determine the dates of the superior elements. If you have already entered dates for the superior WBS elements, the system deletes them, and calculates new dates based on the dates of the subordinate WBS elements.

In your scenario, i feel the network scheduling has impacts the WBS element date. If you have adjust basic dates, i hope this should be the impact.

Regards

Terence

[sunil_yadav2]

Hi Maria,

is 'Adjust Basic date' affect dates from network activities. like confirmed activity will not be calculated as per previous post?

thanks

SUnil

[MTerence]

Hi Sunil,

Go to Project System - Dates - Scheduling - Specify Parameters for Network Scheduling

Check the Adjust scheduling assigned to your network type.

Regards

Terence

[sunil_yadav2]

Hi Maria,

Adjust basic date means as per SAP Help:

If you have set the Adjust basic dates indicator and are using forwards scheduling, the subsequent backwards scheduling starts at the scheduled finish date.

Similarly , in the case of backwards scheduling the scheduled start date is used for the subsequent forwards scheduling. If you do not set the Adjust basic datesindicator the two scheduling runs occur independently of another, starting at the basic start and the basic finish dates. In this case you must have maintained both the basic start and basic finish dates.

does this means to not to include confirmed activities for scheduling?

thanks

Sunil

[MTerence]

Hi Sunil,

Did you check the scheduling parameters mentioned in my earlier reply ?

Regards

Terence

[sunil_yadav2]

Hi Maria,

yes i have checked and posted earlier also. we have adjust basic date at network as well as wbs scheduling.

i just want to know whether adjustment will be done according to activity status because dates of activity which are already confirmed, system is not taking dates from these activities.

thanks

Sunil

[former_member201206]

Hi Sunil,

The status of activity can affect the scheduling the concret dates, but not affect if the WBS get the basic dates or not.

The consulting note 683940 I wrote some years ago is still valid:

How are the dates of the activities copied to network headers and WBS
elements?

The system determines the scheduled dates of the network header as a
maximum date frame of the scheduled dates of all respective network activities.
The scheduled dates of the WBS elements are in each case determined as a maximum
date frame of the respective activities.

If you set the 'Adjust basic
dates' indicator, then both the basic dates of the network header and the WBS
elements are set due to the activity dates. The system does not consider
indicator 'Adjust basic dates' for the scheduling parameter of the network
scheduling. Bear in mind that different activities are participating here as
well: for the network header of all respective network activities, for the PSP
element of respectively scheduled activities.

Kind regards,

Zhenbo

[sunil_yadav2]

Hi Zhenbo,

thanks for your reply:

as per previous conversation i want to know that if one of activity is finally confirmed than while scheduling again is this activity does not have any affect on scheduling.

because in system, scheduling works fine at first time but when i am confirming a activity for

example start date 21.02.2015 and finish date is 24.02.2015, if i confirm this activity on same date start date 21.02.2015 and finish date is 24.02.2015, so system is recalculating dates for network and wbs as 25.02 2015 as start date where as it should be 21.02.2015.

please clarify  this.

thanks

Sunil

[MTerence]

Hi Sunil,

You need to change the Network scheduling Parameter to "Do not Adjust" and try to re-schedule the same Network / WBS element.

Update us whether it changed or not.

Practically, your case should not occur in reality, since i will not know when the WBS is started (basic start date) if the datas are getting affected through activities. I prefer to change the setting not to impact by WBS basic start date. Then only the scheduling will be perfect.

Regards

Terence

[sunil_yadav2]

Hi Maria,

i will try after changing to do not adjust basic dates in Network parameters.

i have found one SAP Note-142390

which says:

The system determines the largest and smallest operation dates when the basic dates are calculated. During calculation, the system, by mistake, also takes the dates of operations completely confirmed into account.

and after implementing this note:

Implement the program correction.

Dates of operations completely confirmed are only taken into account if all operations of the WBS element are completely confirmed.

Please let me know if this is correct behavior. logically scheduling should take all activity dates in consideration whether confirmed or not all the time (not only if all operations of the WBS element are completely confirmed).

thanks

Sunil

[former_member201206]

Hi Sunil,

yes, it sounds a little confusing, but works as designed

The reason behinder this logic?

1.  as long as not all activites under  a WBS are completed confirmed, the most interesting data for the user is the dates of un-confirmed activities, also the remaining time frame. After all activities are confirmed, the remaining time frame is in fact zero, the remaining time frame becomes un-interesting for the user, now the whole used time frame becomes interesting.     Using the logic, the WBS time frame get shorter and shorter while the activities are carried out and confirmed. Once all activities are done, the WBS time frame suddently get enlarged.

2. as far as I remeber, the same logic has been applied for the network header too.

Kind regards,

Zhenbo

[sunil_yadav2]

Hi Zhenbo,

the same thing happens in only strict bottom up planning where as if i change it to bottom up planning, so this system is taking correct start and finish date without considering confirmed or non confirmed activities.

also as per Maria i tried changing adjust basic date to donot adjust basic dates, it also solve the query. but in do not adjust basic dates settings we would not able to see change in any dates when we extend or suppress dates in activity or lower wbs.

please clarify this.

thanks

Sunil

[former_member201206]

Hi Sunil,

yes, it can be.

The difference between bottom up & strictly bottom up.

Bottom up considers the dates of WBS itself during roll up, that means, the WBS does not get shorted, rather can only be enlarged.

Strictly bottom up: the dates of WBS are  solely determined using underlying activities.

Kind regards,

Zhenbo

[sunil_yadav2]

Hi All,

i think this issue is coming due to Adjust Basic Dates. if i am changing to do not adjust basic dates, dates of project & WBS is taking as per activity start date.

Experts Please correct me if i am wrong.

thanks

Sunil