Field help (SIMSTA) 

This field is only active on validation. It is used to define the status of the journals generated by the processing:

The status essentially defines the ability of the user to modify the journal. Once the status is final, the modifications that can be carried out on a final journal are only for information or they concern the analytical postings. The date, the amounts, the accounts, the VAT code and other purely accounting information can no longer be modified.

In temporary status, the journal remains totally modifiable.