ASCP Yield and Resource Lead Times

Hi,
I am working on Advanced supply Chain Planning on R12. Both ERP Source and Planning are on different instances. We are also using Oracle Shop Floor Management. In the Network Routings we have included a lead time resources at step 10, 20, 30. The resources are as follows:
These resources are defined as 'Machine'
Resource for operation 10: ASSY-LT, 112 hours, Schedule 'yes'
Resource for operation 20: TEST-LT, 64 hours, Schedule 'yes'
Resource for operation 30: PACK-LT, 48 hours, Schedule 'yes'
We also have only one shift with 8 hours. The resources are not available for 24 hours.
We also have yield at each of the above operations.
Lead time rollup calculates 28 days for the item correctly.
We are encountering a problem with ASCP Plan. The start dates and yield calculations using constrained plan with Enforce Demand Due Dates constraint seems problematic. If we check 'Calculate Resource Requiremnents' option, the plan calculates yield but the lead time gets reduecd by one third and start and completion dates for a planned order (and ATP etc.) are not accurate.
If we uncheck 'Calculate Resource Requiremnents'option in the plan, lead times are accurate but plan does not calculate yield.
We are not sure what is causing the problem.
Does anybody know what options or profiles control this behaviour?
Your help is highly appreciated.
Thanks.
Vijay

Hi Vijay,
important for your lead time calculation is the setup of the calendar and shifts and what shifts are assigned to the resource.
You say you do not have enabled the 'Available 24h' option. We are also using leadtime resources in certain cases, for example LT for Assembly. But in these cases we enable the 24H option. Next to this we set the Resource capacity to 'unlimited' by setting units to a very high number (1000 etc.) on resource level, to prevent that the system gets into capacity conflicts here.
And the yield calculation indeed should be quite independent of the leadtime resource.
best regards,
David.

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