SAP Message C2087 - Error during deletion of purchase requisition &1 for order &2

C2087 : Error during deletion of purchase requisition &1 for order &2

121036Error C2087 in initial archiving run
89548Production order: Error C2087 or BS001 or OPR_NOT_FOUND
120295C2087: Error when deleting purchase requisition ...
214021Initial archiving run terminates with message C2087
75008Archiving: error message 06407: PReq is missing