https://userapps.support.sap.com/sap/support/knowledge/en/2519874
2519874 - Function module "ENQUEUE_E_DMC_ACPLANGUID" not found - SLT | SAP Knowledge Base Article
ST22 dumps show error similar to below: Category ABAP Programming Error Runtime Errors CALL_FUNCTION_NOT_FOUND Except. CX_SY_DY