Primary segment values assigned to one LE shouldn't be allowed to be used by other LE

We have two primary segment values 1 and 811 and one BU, Primary Segment 1 is assigned to LE1 and Primary Segment 811 assigned to LE2. While user has only data access to Primary Segment 1 but the user while trying to create an AP Invoice it's allowing to select Primary Segment 811 which is assigned to LE2. This shouldn't happen.