If the infotypes in question are standard PD infotypes you could use SAP_PD service to update them.
For any other tables you will have to go with a advanced generic service or do the update in a background workflow task.
Refer here to the post by Christopher Solomon's Profile | SCN: http://scn.sap.com/community/erp/hcm/blog/2012/08/20/hcm-processes-forms-when-all-else-failsadvanced-generic-services
Hope this helps.
Regards.