Single XML for PO and ITEM for Third Party Warehouse from ORMS through RIB

Hi,

We are implementing third party warehouse and working on RMS 14.1.3. As per current process, there are separate family and message types for ITEM and PO. And to publish these messages there are specific triggers and Publishers. But we need to generate single XML for  PO and ITEM. Like POCre XML would be having all ITEMCre information.

In our project, Items are created at the time of PO creation only through third-party integration with help of base PO/ITEM API.

This thing definitely requires new custom objects, changes in RIB, Adapters, TAFRs etc.

Can you please guide us, how to achieve this customization.