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Entity Updates with Defining Query Error
When attempting to update entities in Entity Framework 1, an error may occur if the targeted entity set has a DefiningQuery but lacks an
Unable to update the EntitySet - because it has a DefiningQuery and no <UpdateFunction> element exists in the <ModificationFunctionMapping> element to support the current operation.
Possible Causes
The error typically arises due to one of the following reasons:
Resolution
Note: Simply deleting and re-adding the entity may also resolve the problem, but it's important to address the underlying cause to prevent recurrence.
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