Storage category for OAER

Hi All

we are using document management system(DMS) and have separate content server for saving documents. Now we are start using Business Document Service (BDN) functionality Business document Navigator (OAER). While using this functionality system is not saving document on content server. in pervious process we change storage category for SAP office now document are saving at new storage category. my question is

1. business document navigator is using which document class
2. in table SDOKPHCL find document class for OAER for maintaining storage category.
3. is transection SKPR08 showing storage category for OAER or OAOR?

waiting for your valuable inputs

Thanks & Regards

AR