No status object is available for CRE 0/0/0 in MRSS

Hi experts

Grateful if you can guide me sometimes when a resource planning system do not allow throwing error:

No status object is available for CRE 0/0/0

Backward integration of the assignment is not possible

if the availability of technical for the dates you want to plan this is available is reviewed.

The message does not advance planning. This appears in the transaction /MRSS/PLBOORG

Thanks

Regards

Damy