Errors when running simple Copy Function in PAK

Hello,

we experience an error when running a planning sequence with a very simple filter and copy function.

All we do is copy actual data from an advanced DSO to a planning ready advanced DSO.

Our system runs BW 7.5 SP04 on HANA (Revision 122), PAK is enabled.

When we run the planning sequence the following error occurs:

"System error in program CL_RSPLS_SESSION_STORE_MANAGER and form SELECT_VIEW_DATA-03-"

I could not find any Notes covering that behaviour.

So every idea or hint is appreciated.

Thanks in advance.