We are currently using SAP HR 4.6C on EP 5.0. Our organization is thinking about building the ESS/MSS interface from scratch, on a different platform like Weblogic or Websphere, without going through SAP EP.
At initial evaluation, we felt that it is very technically challenging to achieve the above. However, we'd appreciate some advice coming from an expert.
In general it's always easier to go with what your primary vendor – in this case SAP – is offering, if for no other reason than when things go wrong, you have only one "throat to choke." Unless there is a truly compelling business case for doing this, the technology case is hard, if not impossible, to justify.
This was first published in October 2005