Default value to add to a rule input which is of CDT

Question

Hi, 
 I have below kind of interface (editable grid) to upload multiple documents. By default, I am providing 1 row and when user click on "Add Document" I am adding additional. 
 
 I have a rule input which is of CDT like below

I was able to insert " Document Type " value to DoCTypeCode and " UPLOAD " to DocumentID. But, I was unable to inert values to "DateAdded" and "AddedBy". 
 I have to store " DateAdded" as loggedinuser() and "AddedBy" as now(). 
 Is there away I can load default values into these columns in the page load or when the user selected "Document Type" dropdown.

Thanks.

GopalK · Answer

Hi Hari, yes you can do that in your dynamic link's saveInto. You can configure something like below, 
 a!save(ri!yourCdt, 
 append( 
 ri!yourCdt, 
 type!yourCdt( addedby:loggedInuser,addedOn:now() 
 ) 
 ) 
 Another way would be to use script task in your process model to update the process variable which will be inserted to db.