Update Record field Value in expression

Question

I have an interface where collecting the information & storing in record type. 
 Then sending this record type rule input to process model to store in db using write records 
 However before that write records node, I need to update a few of the fields of the record type. 
 
 I have tried to update the fields using the following expression, however the data which got from interface is becoming null and record type is updating only with the expression values. Can any one pick it up and shoot it?

Stefan Helzle · Accepted Answer

Our best practice is to add a bunch of a!save(), one for each field, to the saveInto of the submit button to populate fields not entered by the user.

Harsha Sharma · Answer

Hi Shukur 
 Instead of a!update, create two custom outputs and save in respective fields. E.g. 1st output variable expression will be "RAJ12344" and saveinto will be your recordtype!recordname.fields.username. Similarly 2nd output variable will have true() in expression and save into isActive field of your record. This will leave all other fields of your record as it came from interface. 
 a!update() is making all other fields as null and doing operation on just the fields you mention in 'index'. So either do the above or mention all the fields in the index and corresponding values in 'value' of a!update. a!update(
pv!applicantInfo,
{recordtype!record.userName, recordtype!record.isActive, recordtype!record.createdBy, recordtype!record.createdOn},
{"RAJ12344",true(),recordtype!record.createdBy, recordtype!record.createdOn})

Update Record field Value in expression

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