Question related to concept of PCK

Hi All.
I am quite a newbie to XI and am only learning it thru online help. I have one conceptual question related to PCK.
My understanding is that PCK is needed by a small business company to communicate to its larger partner which already has XI running. Correct me if I am wrong here itself.
Now if the larger business partner already has XI, why does the smaller one need a PCK at all? The XI instance on the larger partner will have all the necessary adapters to understand any format send by the partner. So even if the partner(smaller) sends any format- be it IDOC/HTTP/FTP, the XI instance on larger partner will have its adapters ready to perform the conversion.
Then why is this PCK needed at all?
Thanks in advance. Hope my query is clear
Regards.
Samant

Hi Samant,
Your question is a very good one, Though I have not worked on PCK, I can share my ideas based on some brain storming session I had with our collegues & business partners.
While executing projects, there are technical & operational issues. For example, when you access any HR related data of a UK based organisation then all those who work on that project have to undertake data security pledge. Like wise there are many constraints on data & system accesses, which vary across organisations.
When you use PCK*, irrespective of different systems what the small vendors have, you communicate with your Big company's XI system only on the XI's msging protocol http(s)/SOAP. This allows a fair amount of ownership of data/access related issues to the small partners.
-> you go for PCK, when there is no need for small vendors to go for XI.
Hope this is of some help. As Michal said there might be much more (or even better) reasons.
Michal, when you say "all of the mappings and transformations have to be on the small company side", what exactly you mean by this. can you please eloborate.
Thanks & Regards
Vishnu

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