AX 2012 R2 CostGroupType Enum in InventPosting form

We are trying to create a new InventPosting record using the InventPosting form -> Standard coast variance tab -> Production quantity variance bullet.
We have the following selected in the Grid:

Item code = All
Item relation = blank
Cost code = Group

Now when we try to select a record under "Cost relation", selecting "4" (Indirect) throws an error saying:

"The value '4' in the field 'Cost relation' is not found in the table 'Cost group type'."

When looking at the CostGroupType enum in the AOT, Indirect is last, but has an enum value of 3, not 4. I'm wondering if this is a mix up with the enum's index position vs actual value?  

Does anyone know if this is a known issue?  Can't find anything in customer source about a hotfix.