After 'delivery completed' is set we can still post a Goods receipt

[SAPSupport]

After posting a goods receipt for a partial Qty against a purchase order item and setting a delivery complete flag 
in the PO item. We find it is still possible to post a goods receipt even if the delivery complete flag is set in the PO item ? 

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[SAPSupport · Accepted solution]

This is the standard system behaviour please refer to note 856279 - MIGO: Proposed qty despite 'delivery completed' indicator.

If desired you can implement a custom check on the delivery complete field using the available BADI's for the 'post goods movement - migo'
app or the 'post goods receipt for purchasing document' fiori APP, using the CHECK BADI's listed here 
You can check the contents of the field 'ISCOMPLETELYDELIVERED' of the reference PO item using the released CDS view I_PURCHASEORDERITEMAPI01
and issue an error message as required.