STO: How to partial GR of HU stock from 'Stock In Transit'?

Hi All,

Please help if you have come across the below issue before.

Scenario:

Create inter-company STO

Create Outbound Delivery, pack items and PGI

PGI posts stocks in transit, creates Inbound Delivery including HUs from Outbound Delivery using output type 'SPED'.

Requirement:

At receiving plant, we like to receive partial HU quantity instead of full HU quantity.

This is due to damage in transit, theft etc

No standard SAP transaction allows to unpack, repack, emptying HU even after de-assigning it form Inbound delivery.

NB: Please note the partial GR need to posted on receipt of 'SHPCON' message from receiving plant/3PL. But please tell even if it is possible using any other interface message, standard transaction, BAPI's etc.

Thanks in advance

Veer