From my understanding this generally happens if the report BBP_GET_STATUS_2 is not scheduled as needed You should schedule this report to run daily in the SRM System, so that information on the status of purchase requisitions, purchase orders, and reservations is up-to-date.
For more information, read the report documentation.
Read more at the link below
https://help.sap.com/saphelp_srm50/helpdata/en/24/64474ecfaf11d2b463006094b92d37/content.htm