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SSIS error: The SQL command requires a parameter named, which is not found in the parameter mapping

SSIS error message:
The SQL command requires a parameter named "@aaaa", which is not found in the parameter mapping.

Cause and Solutions:
1. The parameter is really not exists. Solution: declare it.
2. Space - " " - in the mapping pf the parameter - see the picture below. Solution: delete the space.


OUTPUT Clause for the MERGE Statements

MERGE ....
USING...
WHEN ...
WHEN ...
...
OUTPUT
   $action,
   inserted.*,
   deleted.*;