Hi Debbie,
Thank you for picking up the thread. is particular thread has 113 views since 9th April, but no one has replied , in the mean time we have managed to load the files to Ariba On-Demand (and learnt a lot of good things about how things work in Ariba.)
We have Ariba consultants as part of the project. They are helpful to provide the guidance, however, for the files which are not generated by Ariba, they advised us that the information is to be manually populated in csv files. I wanted to know how other customers have done this. If w have faced a issues, surely other customers wud hv also faced similar issues.
I have posted the question related to the field mapping because what was supposed to be 'out of the box' solution, is not actually an 'out of the box'. our team had to produce around 60% of the files required to make the ariba work.
1. The Data dictionary is not a true representation of the file structure which can be loaded to Ariba On-Demand.
2. Files generated using Ariba provided extraction tool generate csv files bu the files needs further modification to make it work 
Regards
Rahul