How To Fix VC702 - The template should contain only ' ' or separators other than ' '

SAP Error Message - Details

• Message type: E = Error

• Message class: VC - SD Customizing

• Message number: 702

• Message text: The template should contain only ' ' or separators other than ' '

What causes this issue?

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

How to fix this error?

Please correct the template.

Error message extract from SAP system. Copyright SAP SE.