Validation Restricting Entry to One Cost Object

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I am trying to create a validation in GGBO to restrict postings of Vendor Invoices (KR doc type) and journal entries (SA doc type) to only one cost object (cost center, internal order or WBS element) on expense account lines. I understand standard functionality limits posting to only one "real" object; however, getting the business to understand has proven difficult so I need a validation.

I have the following in the Prerequisite:

BKPF-BLART = 'KR' OR BKPF-BLART = 'SA' AND

BSEG-HKONT >= '700000' AND

BSEG-HKONT <= '799999'

For the check I have tried numerous ways, but below is one attempt:

BSEG-AUFNR <> ' ' AND BSEG-KOSTL = ' ' AND BSEG-PROJK = ' ' OR

BSEG-KOSTL <> ' ' AND BSEG-AUFNR = ' ' AND BSEG-PROJK = ' ' OR

BSEG-PROJK <> ' ' AND BSEG-AUFNR = ' ' AND BSEG-KOSTL = ' '

Nothing is working and I am getting frustrated. Any ideas?

Thank you in advance!