
You do not have permissions for future posting documents
You have tried to add a document with posting date that is later than the current date however, you do not have the required authorizations
Ask your super user to grant you the required authorizations, by performing the following procedure:
From SAP Business One Main Menu, choose:
In the Authorizations window, select the user name for whom the authorizations are required (by clicking the user name on the window side)
Expand the General group of authorization. Find the authorization Future Posting Date in Documents and change the value in the Authorization column to Full Authorization
Choose Update