Change Receipt Quantity for Planned Order in LiveCache

Hi Experts,

I am very new to SAP APO and I am an ABAPer. We have got a requirement to update receipt quantity in /SAPAPO/PPT1 transaction based on some conditions. I have looked into FM BAPI_MOSRVAPS_GETLIST2 to fetch receipt data under OUTPUT_NODES, but FM BAPI_MOSRVAPS_SAVEMULTI3 is not helping me with receipt data update. I have even checked several other options, but in vain. I have tried implementing several BAdIs also, still no luck.

Can anybody suggest if we have any way to do this? Your help is highly appreciated.