Secured creditor asserted a security interest in debtors' postpetition accounts receivable, based on both its prepetition security interest in debtors' inventory and a previous court order allowing debtors' use of cash collateral upon certain conditions. The court ruled that its cash collateral order had not granted creditor a security interest in postpetition accounts receivable, and that creditor's lien only extended to postpetition accounts receivable that were proceeds from sale of prepetition inventory. Specifically, creditor's lien did not extend to proceeds from sales of inventory that debtors had acquired postpetition.