Need Clarification in Operation Mapping , how the data flows between two mappings in one operation mapping

Hi Experts ,

1)Please explain me how the data flow between two mappings in one Operation mapping. for example i have requirement

2)From source .CSV files will be zipped and sent to PI , need to unzip the zipped .CSV files and then need to convert into xml .

To Unzip the zipped files i am using the "AF_Modules/PayloadZipBean" this module.

To convet the .CSV files to XML I am using the "AF_Modules/MessageTransformBean" this module

But the problem was if ZIPPED file contains more than one .CSV file every thing is getting unzipped and the first .CSV is getting converted into XML , rest are getting failed in moni.

Error from Moni:-

RuntimeException during appliction Java mapping com/sap/xi/tf/_MM_FileSender_To_FileReceive_ Thrown: com.sap.aii.utilxi.misc.api.BaseRuntimeException: An invalid XML character (Unicode: 0x3) was found in the element content of the document

We are using the PI 7.31.

So i am trying to use the Java mapping for Unzipping and for conversion to XML from .CSV

Please tell me any idea which  works for my requirement .

Thanks,

Vijay Kumar