I tried to decipher your question after translating it, as per my understanding of the issue you are facing unit-related error on the purchase order, to resolve this error ensure that the unit of measure setup in the "Released product section" is accurately configured. This will increase the chances of resolution of this error. Plus, you should apply proper āunit conversionā in case you are having different units and the system can not convert them by itself e.g. Box to Each. In the purchase order try to use the units that have been configured in the product management page. I'll also translate this to Spanish for your better understanding.
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