Volume Credit Method
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The organisation using volume credit must create and manage a credit account in a single measurement unit
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The credit account must be established for individual product types of the product group or for the whole product group where the same measurement unit is applied to all product types
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Certified credits can be accumulated in the credit account for a maximum of 12 months, meaning that if the total credits are not used in a 12 month period then the credits accumulated 13 months ago are lost