2905616 - Unexpected authorization error in Purchase Requisition

Display a Purchase Requisition in the 'Display Purchase Requisition' - Advance APP  (ME53n) ,Error  'Authorisation missing' appears for the Document type, Plant, Purchase Org and Purchasing Group.

This is not expected because your user ID has full authorisation to display Purchase Requisitions.

Missing authorization: PReq Change: Doc.Type XX

Authorization Missing for Doc.Type XX; contact administrator

Authorization Missing for POrg ABC; contact administrator

Missing authorization: PReq Change: Plnt YYYY

Authorization missing for <PGrp> <XYZ>; contact administrator

SAP S/4HANA Cloud Public Edition

Open 'Display Purchase Requisition' - Advance (ME53n)
Enter Purchase Requisition Number and press return 
Errors raised 

When any user displays a Purchase Requisition an authorisation check is also carried out against the user that created the Purchase Requisition.
As per the error it is likely that the user that created the Purchase Requisition (EBAN-ERNAM) no longer has the authorisation roles to display a Purchase Requisitions, they are locked or have been deleted completely.

If it is necessary to view the Purchase Requisition, then the user will have to be re-assigned the required roles. If the user is missing ,the system adminstrator would need to re-create the CB user. This can be done using the templates in the 'Manage Workforce' APP.

M_BANF_BSA, M_BANF_EKG, MMPUR_REQ_COMMON097, CL_MMPUR_SSP_AUTH_CHECK_FOR_RE, LMEREQF05, AUTHORITY-CHECK, EBAN-ERNAM, authorization missing, ASSIGN AND PROCESS PURCHASE REQUISITIONS, , KBA , MM-PUR-REQ , Purchase Requisitions , Problem