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Home/ Questions/Q 956193
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Editorial Team
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Editorial Team
Asked: May 16, 20262026-05-16T00:30:23+00:00 2026-05-16T00:30:23+00:00

I have a table with about 30+ columns, so i decided to group them

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I have a table with about 30+ columns, so i decided to group them using complex types.
When trying to build the assembly, i get the following error:

Error 3023: Problem in mapping fragments starting at line 933:Column TableName.ColumnName in table TableName must be mapped: It has no default value and is not nullable.
One of my complex types includes a property with that exact name, and that exact data type. Any ideas on how i can approach this?

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  1. Editorial Team
    Editorial Team
    2026-05-16T00:30:23+00:00Added an answer on May 16, 2026 at 12:30 am

    Ok i was too quick to blame it on Entity Framework, the problem was that i had the same table in the schema before, only mapped to a different table name (both tables have exactly the same structure and are in the same database). Now what i did was remove the reference to the old table and add the new one to the schema, and then i added the complex types that were already built for the old table. This of course was a problem because the complex types were mapped to columns in the old table.
    So what i did was delete the complex types and recreate new ones from the new table. Problem solved.

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