Output Type not triggred at P.O creation but at Change

Dear All,

Iam experiencing a weird error inregards to defaulting of Output Type while P.O creation.

Here is the breif background:

1) We are maintaining Condition Table for a Custom Output Type with Key Combo - P-ORG/Doc.Type/Mat.Type/Plant

2) This output should trigger while P.O creation to send an IDOC to a third party system

3) All the necessary Profiles and partners are maintained for the Output type

4) The condition does not default when I first create the P.O but defaults when I come back and do any change and save it.

Has anybody experienced this before, this seems really weird to me, I tried finding Notes if any but could not.

Thanks in Advance.

Chand