Actually, the inventory control account is assigned to a GL account in Edit Account Sets.
In Laura's case it appears that the Inventory account is set to an expense account, or the AP clearing account is the same as the Inventory account.
Control Accounts like the Inventory should only be posted to by the Inventory module, and only for the Inventory Control account. Adjustments should be made to expense accounts.
Look for a posting that does not belong, or is zero because both sides of the transactions were posted to the same account.
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Kate Spontak
Stief Group
New Jersey, the Garden State