Probable Cause : The ID field was populated with a zero length text value because the original source field was blank and was trimmed of leading/trailing spaces.
Resolution : Detect this problem when it occurs and assign a valid value. For example, you could use the t_length function in conjunction with the blank function as follows: Compute my_controlField = @val_ifelse (@t_length (input.fieldName) = 0, @blank (1), input.fieldName).
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