A family of Microsoft relational database management systems designed for ease of use.
To be clear, this problem only occurs with one record, i.e. the record which has as its Primary Key value 5. Is that correct?
The query you show retrieves records from a table, VEHICLES, and from another query called OWT_BaseQry.
In that source query, it appears that you are retrieving records from still other tables.
In the absence of data to analyze, my first assumption would be that the vehicle ID you indicate, i.e. the one with ID 5, does not appear in the sub query, OWT_BaseQry due to the way it is constructed. That results in errors in this query when you try to concatenate values from it.
The error message itself might be misleading in that regard. It could mean that a recordset isn't pointing to the expected record, and that would correlate with the record not being returned in the sub query.
Open the query called OWT_BaseQry outside of the form. Inspect it to be sure it includes the record which is causing this error. My guess is that it probably will not appear in that query. If it does, then we'll need to dig deeper.