Browser User Exit

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Im making my first attempt to work with User Exit on the browser. I need someone to correct me if I am thinking wrong and maybe throw in some pointer. 

 

The part that is confusing is the extension file. Im not exactly sure what this is.

Im suspecting its more like a parameter file. A method in which to get the

input data to the User Exit program so that it can be worked on i.e. compared,  

checked, edit. I understand I need to modify at least two programs. One that actual populates the extension/parameter file and the other to read it and do some processing and return a result.  

.is  this correct????

 

In the mean time I have identified the User Exit shell programs, located the source on the i5 and Activated both User Exit programs from the Business Object browser. 

 

My next step is to create two files one with keys the other with out. 

The fields in the files are the fields I want to look at and process. Basically I am

creating somewhat of a generic parameter list.

.is that correct????? 

 

Thanks!

JM