Additional attributes for APO data objects

Hi,

In order to provide some be-spoke functionality I have a need to extend some APO data objects with additional attributes. This includes: resource, PPM, Order. For all I have identified that I cannot use exisiting fields, therefore my aim would be to add new attributes (either directly or via reference Z-table).

I have two questions:

1. What's the easiest way to extended above objects with additional attributes?

2. Is there a ways to have those additional fields visible for edition from a standard transactions, eg.: /SAPAPO/SCC03, /SAPAPO/RES01, /SAPAPO/RRP5?

Note: I'm interfacing with non-SAP ERP therefore CIF is not in use, while I see set of BAdis for master data inbound processing. Is this something I could use?

Thanks,

Mrx