When using the item connector to create an item it is possible to create multirow item goals; However, when using the UI for an item the field only allows for a single row entry.
Reproducing the Issue
Try to create a multirow item goal from the UI of an item
There was a JIRA raised on this and engineering determined it to be 'by design'.
If you wish to use a multirowed item goal you need to use the item connector to do so.
LMS SF SUCCESS FACTORS SUCCESSFACTORS CONNECTOR ITEM UI MULTI ROW MULTIROW GOAL COURSE , KBA , LOD-SF-LMS-CON , Connectors , Problem