Goods Receipts with 103 & 105

Dear All

We are Following 103 & 105 process for goods receipts , But we are facing some Problems in stadard process as follows

1. while Posting MIRO for PO having Both 103 & 105 movement it is showing 103 Document as referance document in MIRO .But Our requirement is to show 105 document as accouting entries are happing only at the time of 105

How can I Update 105 document Number In this Field

2. I want Pending Invoices Report ( MIGO done But MIRO not done ) MR11 is giving ressult as per requirement , Here Aslo I am

Getting referance Document as 103 number which is not Useful for user , Here also i want 105 document Number Or accounting Document Number of 105 as referance document

How can i get this

these Issue are very cretical for Business ,

Please Provoide Suggetion

Thanks & regards

Advait