How can a qm-lot be excluded from availability check?

Hi experts,

in oppj I can exclude "stock in quality inspection" from availability check, but the qm lots are still handled as fixed receipts. This is ok, because the qm lots are not a stock. But the availability check shows available quantity and this is, what I don't want!

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The question is: "How can qm-lots be excluded from availability check?"

Thanks for your help!

SAP Anwender