About the DDIC association mapping in tcode:SEGW

Hi experts,
I am trying to build a simpel odata service in segw.
I build the service step by step
1)Created 2 entity type named "map" and "dlink" by importing from DDIC
   at the same time, entityset "maps" and "dlinks" are created
2) Created 1 assocaiton from map to dlink.
3) create the mapping for "maps" and "dlinks" in service implementation
4) the problem is comming.when I try to mapping the assocation, I can't selecte any assocation.
My question is :
why I can't select the assocation created by me in previous step.
and How to create a association which can be selected in the maaping
Please see the attached screenshot for detail information, thanks!

Hi Arindam,
Here some other properties available in Data Model like navigation property, association and mapping. These three properties are very confusing to me. I dont have so much information on these three information.
Is there any definition for these three property? Kindly provide.
you can refer below SAP help on topics you are looking for
Navigation property - Navigation Properties - SAP NetWeaver Gateway Foundation (SAP_GWFND) - SAP Library
Association - Associations - SAP NetWeaver Gateway Foundation (SAP_GWFND) - SAP Library
Mapping - Mapping the Operations - SAP NetWeaver Gateway - SAP Library
also note that this question is more appropriate in SAP Gateway forum.
Regards,
Chandra

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