Diagnosis
To calculate the carrier of a formula group in a structure, inverseformulas have to be defined for all input-ready operands. Theinput-readiness of these operands is normally defined in the samestructure, the structure of the carrier. The carriers and their inverseformulas form a separate formula group for each selection element in theother structure.
Here, modifiable cell &V2& has been redefined by a different celldefinition. This means that the formula definition for formula groupV1 deviates from the rule, and the inverse formula for v2 will beinvalid.

System Response
Formula carrier &V1& is made non-input ready, as formula group &V1&would otherwise not have any correct inversions for &V2&.

Procedure
If you want &V1& to remain input ready, the redefinition of &V2& must bereversed.