Order cannot be placed using "Create sales order" fiori app

Question

We have setup "create sales order" fiori app and tried to place a order. We encountered with the error saying "In the context of Data Services an unknown internal server error occured" whilst clicking "Checkout" button.
We looked up Error log and found the detailed error "Invalid format (return table): Row Number 1, Property Name 'SalesOrderSimulation', Property Value". Full error log xml is as follows,
<?xml version="1.0" ?>
- <ERROR_CONTEXT> 
<ERROR_INFO>Invalid format (return table): Row Number 1, Property Name 'SalesOrderSimulation', Property Value ''</ERROR_INFO>  
- <ERROR_RESOLUTION> 
<SAP_NOTE>See SAP Note 1797736 for error analysis</SAP_NOTE>  
<LINK_TO_SAP_NOTE>https://service.sap.com/sap/support/notes/1797736</LINK_TO_SAP_NOTE>  
</ERROR_RESOLUTION>
<_-IWCOR_-CX_DS_INTERNAL_ERROR />  
- <_-IWCOR_-CX_DS_EP_ENTITY_ERROR> 
<INDEX>1</INDEX>  
<PROPERTY>SalesOrderSimulation</PROPERTY>  
</_-IWCOR_-CX_DS_EP_ENTITY_ERROR>
- <_-IWCOR_-CX_DS_EP_PROPERTY_ERROR> 
<PROPERTY>SalesOrderSimulation</PROPERTY>  
<VALUE />  
<TYPE>\TYPE=STRING</TYPE>  
<OFFSET>0</OFFSET>  
</_-IWCOR_-CX_DS_EP_PROPERTY_ERROR>
- <CX_PARAMETER_INVALID_TYPE> 
<TYPE>\TYPE=STRING</TYPE>  
</CX_PARAMETER_INVALID_TYPE>
- <SERVICE_INFO> 
<NAMESPACE>/SAP/</NAMESPACE>  
<SERVICE_NAME>***Hide_due_to_secure_log_level***</SERVICE_NAME>  
<VERSION>0001</VERSION>  
<SYSTEM_ALIAS>LOCAL</SYSTEM_ALIAS>  
<DESTINATION>NONE</DESTINATION>  
</SERVICE_INFO>
- <SYSTEM_INFO> 
<REQUEST_URI>/sap/opu/odata/sap/***Hide_due_to_secure_log_level***</REQUEST_URI>  
<REMOTE_ADDRESS>xxx.xx.x.xx</REMOTE_ADDRESS>  
<APPLICATION_SERVER>eccdev_ECD_10</APPLICATION_SERVER>  
<HUB_VERSION_INFO>System ECD/200, NW Release 7.40, SAP_GWFND SP10, Internal GWFND Version 011</HUB_VERSION_INFO>  
</SYSTEM_INFO>
</ERROR_CONTEXT>
Please look at the screenshot for more details on request.
Do you have any idea how to fix this bug or do we have a mistake in our configuration?
Thanks for any hints.

Answer 1

Have you been able to solve this issue without resorting to a core mod described by Gopichand above? In our system the notes referenced by Masa in another post are not applicable because of the SP-level of the components involved. We've got:
SAP_GWFND
740
0010
SAP Gateway Foundation 7.40
SAP_UI
740
0011
User Interface Technology 7.40
SRA017
600
0006
Create Purchase Order OData Integration
UIEAAP01
100
0005
UI for ERP Central Applications
UIX01CA1
100
0004
UI for Cross-Applications
UIX01EAP
100
0005
UI for ERP Central Applications
Based on the fact that the error seems to be caused by the mismatching types of the SalesOrderSimulation property, the component at fault is SRA017 or possibly the GWFND component itself. In another system we're on SRA017 SP5 and SAP_GWFND SP9 and the app works without an issue. Since both those SP's are 1 level lower, it further confirms that it must be SRA017 SP6 or SAP_GWFND SP10 that cause the issue.
I have not been able to find any recent OSS notes that would address the issue and will be opening an OSS incident for it. If you happen to already have a solution, then please let me know. If not, I'll provide an update once I've heard from OSS folks.
Lukasz