WBS, Business Area and Profit Center not flowing in GR/IR Account

Hello Experts,

I have come across a very strange situation. I have two MIGO documents which are showing different posting characteristics:

1) FI Document 5000000553

In this document, the Business area and profit center is flowing in GR/IR Clearing Account (15660000) but WBS element is not flowing to this line item.

Screen shot is as follows:-

As you can see from the above screen shot that, for GR/IR Account 15660000. Only Business Area and Profit Center are flowing and WBS Element is not coming.

2. FI Document 5000015602

In this document, the WBS element is going in GR/IR Clearing Account (15660000) but Business area and profit center is not flowing to this line item

Screen Shot is as follows:-

From the above screen shot, Business Area and Profit Center are not flowing but WBS Element is coming.

Could you please let me know what could be the possible reason for this behavior of both the documents.?

Regards,

Amit