BAPI to change user password on child system from CUA

I am trying to find a BAPI which will allow me to change a user's password from our Central User Administration system where the user's access and password is on the child system.

I am using BAPI_USER_CREATE1 to create the user but if I enter the password in here it doesn't do anything.  I can't run a BAPI on the child system as we have the password field locked down so it's only maintainable in CUA.

I've searched on here and found plenty of people asking the same question but no solution which fits my requirements is being offered.

Any suggestions welcome.

Thanks,

Gill