communicate SAP MM with a catalog

Hi Masters,

I need to know if it is possible to configurate an external catalogue with SAP MM (6.0 ECC) for purchasing order.

I searched info about it, but all i got was sth about OCI ,tansaction MECCM and the badi PLM_CATALOG_IF. I have some questions,

1.- is it possible to connect the purchasing orden to an external catalogue? how can i do ? the help sap doesnt say too much about it.

2.- there is a bapi (PLM_CATALOG_IF) that communicate SAP with an external catalog, how to use it¿? does somebody use it?

thanks a lot.