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In the DIN 276 converter there are tables for HOAI-based cost calculation: Fee invoices by age HOAI (before HOAI 2009) are often not verifiable. The main reason is that this version of the HOAI refers (fees for architects and engineers) to the old DIN to determine the construction costs. Architects who charge by the HOAI before 2009 are, on the one hand requires the construction costs according to the current edition of DIN to create 276. On the other hand, they must determine the eligible construction costs for their fees according to DIN, as amended in 1981. So it must be created two different cost calculations. This labor-intensive overhead save most architects and set their fee invoice the current DIN basis. However, this is very risky because the builder gem. BGH judgment of 22.01.1998 (VII ZR 259/96) may refuse to provide fee payment with regard to the lack of auditability. Many builders have made use of this possibility in the past, either to avert claims from broken design contracts, or simply to delay the due date of payment. The program "DIN 276 converter" for Microsoft Excel creates security for architects and engineers. This cost can be determined according to the current DIN 276 (2008-12). In the background, an assignment of costs to cost groups entered the old DIN. Then the expression is carried out for determining the costs according to the new DIN for fee invoice for the old. The new HOAI 2009 refers to the DIN 276-1: 2008-12, so that a Konve