Communication between PO check BADI (ZBBP_CHECK_PO) and workflow

Running SRM 4.0

I'm facing a problem to communicate between a BADI executed when entering PO Change mode and the Workflow that is started when the changed PO is saved.

1. I have identified a BADI that determines the "old" account assignments (cost centers) when the PO is put into change mode.

2. The old account assignments (cost centers) are exported to memory:

EXPORT lt_costcenters = lt_costcenters TO MEMORY ID 'OldCostCenters'.

3.The problem occurs when I try to import the old cost centers in a ZBUS2201 attribute that is called/read from a workflow that is triggered after PO save.

I simply cannot use IMPORT lt_costcenters = lt_costcenters FROM MEMORY ID 'OldCostCenters'. anymore (probably because the workflow is triggered indirectly)

This problem can of course be solved by creating tables that temporarly holds the values, but I would like to avoid that.

I have also tried to use the function module BBP_CHANGE_DOC_GENERAL to access cost center changes, but when having multiple cost assignments (multiple cost centers) the "Display Change Documents" does not show old/new cost centers. This only works when having a single cost center.

Thanks in advance!

Regards,

Teodor