Issue in DP91 - Plant is missing

Dear all,

Here I am having an issue while creating DP91 and subsequently simulating for Debit Memo. I created a contract and maintained the plant (I am not maintaining the plant in Material, Customer or CMIR). After doing subsequent process CAT2, Approval, CAT5, ow I go to DP91, but system is not copying the plant from preceding document and pricing is also not determining according. If I simulate for Debit Memo, in line item shipping tab, plant is not copying. Can anyone tell me what is the issue? I am attaching the screen shot here.

And after simulating the Sales & Distribution document, plant is missing. Plant should come from Contract itself.

Regards

Abhishek