the Transaction CL20 is called in the SAP Standardprogram SAPLCLBA in the include LCLBAU01:
"CALL TRANSACTION S_TCODE USING CL_BDCDATA MODE TCODE_MODE UPDATE TCODE_UPDATE."
Sometimes you get the errorcode 1001. I looked for SNotes at the SAPService and there are hints that there is a problem the the batch input, but found no suitable solution. The problem ist that I want to save a new classifiction but the data ist lost because the call of the mentioned transaction doesn't work without mistake. Thanks for your help.