Diagnosis
The prerequisites check for status changes has revealed that theTasks tab page is not maintained for reference force elementSyst-msgv1.

Procedure
Call up a transaction, such as Organizational Structure and Tasks(/ISDFPS/TOE1) that contains the Tasks tab page. ChooseStructure Sel. and then the Reference Structure menuentry. Load force element &SYST-MSGV1&. On the Tasks tabpage, create a relationship.