Restricting transaction code VA22

Hi All,

I am trying to restrict transaction code per document status.

I have 2 scenarios, when the quotation is in status A, both users can change and update the quotation, once the status of the quotation is been updated to status B (for example), one user should not be able to change anything on the quotation, while the other can update the quotation.

I am able to restrict the users down to document type, but I do not see any way to restrict the document to status type.

I tried using authorisation object B_USERSTAT, and utilising the authorisation key, but that object is not even being checked.

Any one has any suggestions?

Thanks