SAP Message UI002 - Error in parameter; Parameter name: &

Diagnosis
The Data Modeler recognized a formal error in a parameter. To preventfurther damage, the Data Modeler intentionally cancels the program.
The name of the parameter is:
V1

Procedure
Please print the termination message. In addition, note which actionsand input led to the error. Please contact your SAP administrator todeal with the problem further.