| The number of child elements of the group is less than the lower limit of selection | The number of features that can be selected simultaneously (m) is less than the lower limit of multiplicity (n). | The number of features that can be selected simultaneously in a feature group is less than the minimum number of selections defined in the feature group |
| The number of required selector elements in the group exceeds the selection limit | The number of required features (m) exceeds the multiplicity limit (n). | The number of required features that belong to a feature group is greater than the maximum number of selections defined in the feature group |
| Exclusive relationship between required features | Exclusive relationship with x does not hold. These are always selected at the same time. | An exclusive relationship is defined between features that require simultaneous selection due to the relationship between the feature hierarchy and the 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 the feature hierarchy and the type. |
| Exclusive relationship between parent and child | You cannot set a constraint between features with x in a parent-child relationship. | An exclusive relationship is defined between features that have a parent-child (including grandchildren) relationship in the feature hierarchy. |
| Dependencies between parent and child | Inter-feature constraints cannot be set between x and x in a parent-child relationship. | Dependencies are defined between features that have a parent-child (including grandchildren) relationship in the feature hierarchy. |
| Group selection constraint invalid | Set the lower limit to a value of 0 or more. | Lower limit of feature group <0 |
| ใ | Set the upper limit to a value other than 0. | Feature group upper limit = 0 |
| ใ | Set the upper limit to a value larger than the lower limit. | Lower limit of feature group> Upper limit
and upper limit> = 0 |
| Self-constraint | Self-referential feature-to-feature constraints cannot be set. | Self-referenced feature-to-feature constraints are defined |
| Multiple constraints | You cannot set multiple constraints with x. | Multiple constraints are defined between the same features |
| Feature naming convention violations | Feature names or unique names cannot contain "[", "]". | Feature unique name or name contains kinsoku characters |