BIP check condition then depend on the condition to decide if it shoulddo the rest of the data readi

Hello,

I have a question about BIP.

RTF template, read XML. Depending on the data or conditions, we have two scenarios.

1. When the UBE runs, it could encounter an error and output the error to xml file. For an example, <Message_ID1>123</Error_Message_ID1>.

2. When UBE runs normally and no error is encountered, the data is loaded to XML file normally and the error message will NOT show in the XML.

Currently there is only a big FOR-EACH loop in the template. When error is encountered, the PDF is not generated at all.

My question is that from RTF template, at the very beginning how to check if the error message ID exists or has a value in xml. If the value is greater than blank, output an error message on the output PDF, then do not do the rest of the work(FOR-EACH loop).