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Hi,
I added association between 2 tables (no foreign keys) and getting this error about no mapping.
Added association on diagram looks fine (1 to *) but when I open edml file in notepad there is no mapping indeed.
Why new association was not added/saved?
thanks

Right-click on your association in Model Explorer > Create Storage and Mapping. Does this help?

With Model-First approach, be aware of the following option which allows applying default mapping in SSDL automatically: Model Settings > Synchronization > Mapping > "Enable automatic synchronization of storage part and mapping of the model with its conceptual part".

oh, that was so simple :) thanks that did help.
BTW it was db first approach.