How to use /IRM/IPCR_AGREEMENT_CREATE & /IRM/IPCR_AGREEMENT_CHANGE

Hi,

I have a requirement to read master request and either create or update the customer rebate agreement.

Am new to SAP Vistex and didn't find one single sample code in google search on how to use these 2 FMs.

Please help with the details on how to implement the Function modules:

/IRM/IPCR_AGREEMENT_CHANGE and

/IRM/IPCR_AGREEMENT_CREATE

Thanks,

Ravi