Set Migration date and Process Control

Dear All,

I would like to set the process control to avoid, that any postings will not be created before migration date.

I have set the migration date on 30.9.2017 and the system created the process control record for migration automatically.

Now I want to set the block for all postings that occurs before 30.9.2017, but the system shows error message, that from posting date cannot be earlier than initial migration date.

Can anybody explain me, what I did wrong? I have found the documentation to this topic (Migration of Financial Accounting Data – Set Process Control) and I processed according to it, but I dont have desired result.

Thank you for help in advance.

Regards,

Marian