A split form looks like a main form with a subform, but it's 2 views of the same information. It's not for the 1 side (main form) of a many side (subform) relationship. If you choose a field in either form half and the corresponding field is also selected in the other half then for sure you have a split form. Given the nature of the problem you describe, then yes, filtering a form and then trying to add a record will pose a problem in that you'll likely end up editing records that are already there. You don't have to have the same fields in both halves if you intend to just look at data (e.g. it may be worthwhile to filter with a combo) but I would not use this form type for adding records. For that type of view and record adding, use a subform arrangement. My experience with split forms is in dealing with issues from posters like you, so I'm limited as well. I don't see the point in having 2 views of the same data so it's not likely I'd ever create one for my own use.
Last edited by Micron; 01-28-2020 at 04:41 PM.
Reason: clarification
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.