ModuleVersion entity groups structures

[KatrinHeinze]

https://vscode.dev/github/sdmx-twg/wp-sdmx-dpm/blob/main/docs/models-relationships/02_data_definition/02_high_level_mapping_summary.md#L11-L12

It's not the module entity in DPM that groups variables, tables and operations. It's the moduleversion entity.