If you attempt dynamic reconfiguration and the VTAMLST file contains errors, you might receive unexpected results. Errors in BUILD or PCCU statements or errors in required operands can cause the VARY ACT command to fail, in which case no dynamic reconfiguration takes place. Errors in definition statements can cause unplanned dynamic reconfiguration changes or unplanned dynamic changes in operand values. Depending on the severity of the error in the definition file, VTAM® may skip over resources that have incorrect definitions and process the rest of the definition file. VTAM deletes resources that are skipped unless they are active.