Fiori Sales Order Create is giving the error Invalid format (return structure): Property Name 'SalesOrderSimulation', Property Value ''

Hi Experts

We are using S4HANA system with simple finance installed. We have configured the Fiori create sales order app and customers are showing up properly for the user. It is giving error in the final step where we are pressing the button "Checkout" . The error is given below

When we checked the gateway error log , we found the error message as "Invalid format (return structure): Property Name 'SalesOrderSimulation',  Property Value '' . Please make a note that I have checked the solution given in the link Error for OPEN Create Sales Order  (SRA017)

but none of the oss notes are applicable to my SAP release. The oss notes we checked are given below

• 2070489 - Conversion error.
• 2046735 - Conversion problem with quantity but no unit-of-measure in entity type
• 2094071 - Invalid format error for empty properties

Our Release Info :

SAP NW 740. SP10

SAP_GWFND 740 SP10

SAP_UI 740 SP12

SAP_APPL 617 SP8

Please help.