Create a new infotype record within same infotype

Hi,

I have a requirement to create e.g a infotype 9001 subtype 0001 record when user create a record in infotype 9001 subtype 0002. We cannot use dynamic action because the creation is upon a customised button (not save button). Please advise how can I do this. I tried using HR_INFOTYPE_OPERATION but it does not return the desire result.

Thanks