| The number of child elements of the group is less than the minimum selection limit | The number of simultaneously selectable features (m) is less than the minimum multiplicity (n). | The number of simultaneously selectable features belonging to a feature group is less than the minimum selection limit defined in the feature group |
| The number of required selection child elements of the group exceeds the maximum selection limit | The number of required selection features (m) exceeds the maximum multiplicity (n). | The number of required selection features belonging to a feature group is greater than the maximum selection limit defined in the feature group |
| Exclusive relationship between required features | The exclusive relationship with x is not established. These are always selected at the same time. | Due to the relationship between the feature hierarchy and type, an exclusive relationship has been defined between features that must be selected at the same time. |
| Dependency between alternative features | The dependency with x is not established. These cannot be selected at the same time. | Due to the relationship between the feature hierarchy and type, a dependency has been defined between features that cannot be selected at the same time. |
| Exclusive relationship between parent and child | A feature constraint cannot be set between x, which has a parent-child relationship. | Due to the feature hierarchy, an exclusive relationship has been defined between features that have a parent-child (including grandchild) relationship. |
| Dependency between parent and child | A feature constraint cannot be set between x, which has a parent-child relationship. | Due to the feature hierarchy, a dependency has been defined between features that have a parent-child (including grandchild) relationship. |
| Invalid group selection number constraint | Set the lower limit to a value greater than or equal to 0. | Lower limit value of feature group < 0 |
| Same | Set a value other than 0 for the upper limit. | Upper limit value of feature group = 0 |
| Same | Set a value greater than the lower limit for the upper limit. | Lower limit of feature group > Upper limit
and Upper limit >= 0 |
| Self constraint | Self-referential constraint between features cannot be set. | Self-referential constraint between features is defined |
| Multiple constraint | Multiple constraints between x cannot be set. | Multiple constraints are defined between the same features |
| Feature naming rule violation | Feature name or unique name cannot contain "[" or "]". | Feature unique name or name contains prohibited characters |