SAP Message 3L226 - There are unauthorized characters "&" in the state

Diagnosis
You have entered numbers or blanks in the Population Register Singlecode instead of the aphabetical characters required in their place.
The CURP characters indicating the state must be letters and there mustbe no blanks in between.

System Response
The system interrupts the program run.

Procedure
Make the necessary changes in order to correct the CURP.