Hello,
What do you mean with 'our Idoc is not created only' ?
If you go in your document go to the list of 'output types', you can see the 'output type' that are linked with the document.
Is your output type there ? If yes, what is the status, (is it showing a green/yellow or red icon)
There you have also the option of jumping to the 'Determination analysis'. This list shows you what 'output types' where selected and what the outcome was
If your output type is not in the list, nor in the 'determination analysis' ... something is wrong in your customizing (output determination)