[TYPO3] User function invoked when saving a record

[Michal Szostak]

Hi,

I would like to have this kind of functionality:
- when user saves a record (extended fe_users type) in backend then a custom 
function is being invoked (that creates or modifies a related dam_cat 
record)

My present approche is that I'm using an itemsProcFunc to create dam_cat 
record. But the limitation is that the itemsProcFunc is invoked only when 
the edit form is loaded. Therefore when user makes any changes and clicks 
Save and Close Document button my itemsProcFunc has no chance to update 
related record.

I hope that I've explained my problem clearly :).

The point is to:
a) invoke my custom function when user is saving the record
b) or eventually disable Save and Close Document button

Regards,
Michal Szostak