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May 11, 2011 at 05:53 AM

tax classification in contract



In contract in the line item data when i am changing the tax classification field in billing document tab from 1 to 0 in the conditions tab the condition type MWST is disappearing, ultimately it is causing billing document not to get posted to accounting and in the pricing procedure the MWST condition type is made as required, tax classification in Customer master record is 1(liable for taxes) and tax classification for material is maintained as 1 (full tax), condition record exist for the combination if tax classification of customer is 1 and tax classification of material is 0 and the MWST value is maintained as 0%. this is happening only for a particular existing contract, when a new contract is created when we change the tax classification type in the billing tab to 0 it is making the MWST value to 0% in the conditions

please guide me why the system is behaving unusual for that one particular contract.