Gaps in sap PM

Hi,

Thanks for your previous help.

I am attending interviews for SAP PM. There are lot of people asking about gaps in SAP PM. I want to know the common gaps with explanation.

I got by search that we can get this answer from only experience. But i need any from ur experience to just say something in interview, than keeping quite..:)

Hope you will reply for me as soon as possible. Iam having interview 2maro.

Thanks in Advance.