| The number of child elements in the group is less than the lower limit for selection | The number of features that can be selected simultaneously (m) is below the lower limit of multiplicity (n). | The number of simultaneously selectable features belonging to the feature group is smaller than the lower limit of selection defined in the feature group |
| The number of required selector elements in the group exceeds the upper limit of selection | The number of features that must be selected (m) exceeds the upper limit of multiplicity (n). | The number of features that must be selected belonging to the feature group is greater than the upper limit of selection defined in the feature group |
| Exclusive relationship between required features | Exclusive relationship with x is not established. They are always selected together. | An exclusive relationship is defined between features that require simultaneous selection due to the relationship between feature hierarchy and type |
| Dependencies between alternate features | Dependencies with x do not hold. These cannot be selected at the same time. | Dependencies are defined between features that cannot be selected at the same time due to the relationship between feature hierarchy and type |
| Exclusive relationship between parent and child | Constraints between features cannot be set between x in a parent-child relationship. | An exclusive relationship is defined between features in a parent-child (including grandchild) relationship in the feature hierarchy |
| Dependency between parent and child | Constraints between features cannot be set between x in a parent-child relationship. | In the feature hierarchical structure, dependencies are defined between features that are in a parent-child (including grandchildren) relationship |
| Group selection number constraint is invalid | Set a value greater than or equal to 0 for the lower limit. | lower limit of feature group < 0 |
| 〃 | Set a value other than 0 for the upper limit. | feature group upper bound = 0 |
| 〃 | Set a value greater than the lower limit for the upper limit. | feature group lower bound > upper bound
and upper bound >= 0 |
| Self Constraints | You cannot set self-referencing feature-to-feature constraints. | Self-referencing feature-to-feature constraints are defined |
| Multiple Constraints | Multiple constraints cannot be set between x. | Multiple constraints defined between the same features |
| Feature Naming Rule Violation | Feature name or unique name cannot contain "[" , "]". | The unique name of a feature, or the name contains illegal characters |