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REP-1290: Source datatype incompatible with summary function in column '<column name>'.

Cause:

Your summary column was assigned a Source whose datatype is incompatible with the specified Function. For example, you may be trying to sum a character column.

Action:

Make sure that the datatype of your source column is compatible with the Function you specified in the Summary Column Property Inspector.

Note:  For help on other error messages, see Finding error message help.