Validation/substitution: Programs should be regenerated

What causes this issue?

Although generation of main programs for validation, substitutions and
rules is over, no coding for individual validations, substitutions or
rules was regenerated.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

To prevent potential errors, generate the coding for your validations,
substitutions and rules. Upon completion of the client copy, run report
RGUGBR00 in the target client. When you do so, select the following
parameters:
"Generate rules"
"Generate validations"
"Generate substitutions"
"Generate sets"
"Generate rule usage"
"Generate validation usage"
"Generate substitution usage"

Error message extract from SAP system. Copyright SAP SE.