Hello Alex,

What I see in your description is that the filter is based on Suborder / Relation, while the prefill is based on Suborder  / RelationContactPerson. These are two different properties in your data-item.

This way the prefill isn’t equal to the filter. This is where the issue lies.

Regarding Rit you filter on a specific ID, while prefilling based on the  OrderLine item on the left. There could be a mismatch there.

I hope this helps you to resolve the issue.