Cannot submit workforce compensation plan for approval

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Hello experts,

in dev2 environment we have just implemented Release 21C.

When submitting plan for approval, the attached error message appears even if we have enabled Approval anytime option.

I tested it also in production environment and it works (the error message doesn't appear). Please, keep in mind that dev2 environment is aligned with production one due to a P2T we had a week ago.

How could I avoid to incur in this message?

Kind Regards,

Valerio