3181884 - Error: "You can't delete a non-composing request here." when deleting a purchase requisition

When I search for a purchase requisition and try to delete it using the Delete button displayed in the search results, I get an error: 

Error deleting PRxxx: You can't delete a non-composing request here.

delete error, non-composing, composing status, purchase requisition, delete document, cannot delete, delete button, PR delete, approvable status, requisition status , KBA , BNS-ARI-CP-CORE-AI , Application Integration (between Buying & Sourcing) , BNS-ARI-PUR , Purchasing , BNS-ARI-GB-REQ , Guided Buying Requisitioning , BNS-ARI-INV-ACC-INT , Contract Invoicing Integration , Problem