BPA's not included on PO Number LOV on Purchase Order Summary form

Hi -

For users that are not buyers, it appears that Blanket Purchase Agreements are not included in the list of values in the PO Number field on the Purchase Order Summary form.  Is this standard functionality or can we fix this?

We allow non-buyers access to search for PO's using a inquiry only responsibility, particularly for AP and planning users.  We just noticed this since we are beginning to use blanket purchase orders and releases more and more.  By the way, it appears that non-buyers can search for Blanket Releases using the Purchase Order Summary form, but they just cannot enter the specific BPA number to search.  They can enter type = 'Blanket Release' without a BPA number and all blanket releases are returned.