Hello Stephane, There could be various reason. you should try to check below information in schemas, this.GetClass().Name & IM.GetPort("1","ECX_SIZE") & IM.GetPort("2","ECX_SIZE") & this.CODE & this.STANDARD & this.MATERIAL & this.RATING Also check below wiki - refer Weld neck flange section, where BOM id get split due to extra attribute added to it. Here in your case, you need to check if these attributes mentioned under item code are same or not. Second case may be advised as to change Class name to any logical, say CT_FLANGE_TH and try generating output. However you have to be careful to mention this class name wherever required. HTH, -Regards | Rahul Kumar
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