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Access Query to filter table by Highest Value found in two Fields + iif logic

I have a table in Access with the following fields (see attachment 1):

I would like to write a query using the logic of the following psuedocode:
If Version is null, then return each record for each "ParentPart" where the "Route" is the highest value for that "ParentPart", If Version is not null, then ignore the route and return each record for each "ParentPart" where the "Version" is the highest value for that "ParentPart".

Basically for each parent part I want to grab the entire row if the version number is the highest value in the entire table or if version is null if the route is the highest value.

The second attached file shows what the Output of the query would be for the query.

Thanks for the help

1 Solution
Kevin CrossChief Technology OfficerCommented:
Try with a derived table:
FROM BOMTable b1 
INNER JOIN (SELECT ParentPart, Max(Version) AS maxVersion, Max(Route) AS maxRoute FROM BOMTable GROUP BY ParentPart) b2
ON b1.ParentPart = b2.ParentPart
AND (b1.Version = b2.maxVersion 
     OR (IsNull(b1.Version)=1 AND b1.Route = b2.maxRoute))

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