A v endor beginning balance will not purge if one of the following is true:

• The beginning balance date is greater than the purge-through date
• The beginning balance is not fully paid
• The beginning balance has been paid by a payment that cannot be purged
• The beginning balance has been paid by a vendor credit memo that cannot be purged
• The beginning balance is a vendor credit memo applied to a purchase that cannot be purged
• The beginning balance is related to a job that cannot be purged
• The beginning balance uses a general ledger account that requires reconciliation and the transaction has not been reconciled
• The beginning balance is related to a purchase order that cannot be purged
• The beginning balance was reconciled after the purge-through date

[BCB:161:Chat 50 US:ECB] 

Why do certain transactions or items not purge?