SAP Message VC702 - The template should contain only ' ' or separators other than ' '

Diagnosis A template can contain the following characters: '_' --> Placeholder for a character of a value to be displayed Otherwise --> Seperator A template must not contain the following character: ' ' Example: Value to be displayed: 123456789012345678 Template: _____:_____:________ Result: 12345:67890:12345678 System Response The template is refused by the system Procedure Please correct the template.