Check the data dictionary to see what the description for that field is. Use the windows help file of the it that @hkeric.wci posted. You can search a field name and find where it might be referenced in other tables.
I’ve had several tables the same way. I’ve never seen it cause an issue. I think the Seq is mainly used for ordering lists (baq designer maybe?) . I haven’t really dug into it since ERP doesn’t complain about duplicates. I usually just manually reorder them unless it’s a major task to update.