SAP Message R9E016 - Source to replace variable '&1' is not defined

Diagnosis
Text and formula variables with the processing type Replacement Path
are replaced by a corresponding characteristic value. Characteristicvalue variables are replaced by the result of a query.
The source of the replacement is not defined.

System Response
This is an error message.
Variables with the processing type Replacement Path can only beused if the source for the replacement is defined.

Procedure
Define the source for variable replacement.
For the characteristic value variables, select the query that producesthe result you want to use as the variable. For text variables andformula variables, select a corresponding characteristic value. Thevalue for a formula variable must be an integer; the value for a textvariable muss be text.