1518595 - M7126 Cannot Create Reservation in MB21 for an Order Category - SAP ERP & SAP S/4 HANA

Unable to create a Manual Reservation in transaction code MB21 in reference to an Order which has an Order Category, instead, receive an error:

Error 'M7126: Manual reservation for order category & not allowed' is issued.

Error M7 126 contains the following information:

Cause:                                                                                
You entered an order whose category only permits automatic reservations. The following order categories do not allow manual reservations:                      
.- 10 PP production order                                                             
.- 20 network                                                                         
.- 30 maintenance order                                                               
.- 40 batch order (process manufacturing)                                             
.- 50 inspection lot                                                                   
                                                                                      
What to do:                                                                           
Enter a different account assignment, or cancel the processing.                       
If required, check whether any reservations for the specified account assignment already exist.     

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• Materials Management (MM)
• SAP ERP Central Component
• SAP ERP
• SAP enhancement package for SAP ERP
• SAP enhancement package for SAP ERP, version for SAP HANA
• SAP S/4HANA

SAP ERP Central Component all versions ; SAP ERP all versions ; SAP S/4HANA all versions ; SAP enhancement package for SAP ERP all versions ; SAP enhancement package for SAP ERP, version for SAP HANA all versions

ECC, Manual Reservation, Order, Order Category, Created automatically, M7 126, BAPI_RESERVATION_CREATE1, K_ORDER_READ , AUFK, production order, M7126 , KBA , MM-IM-RS , Reservations , Problem