I'm trying to retrieve records using the getSearchRecordsByPDC and as searchColumn a custom field,

but Zoho replies

1. <response uri="/crm/private/xml/Accounts/getSearchRecordsByPDC">
   <error>
   <code>4420</code>
   <message>Invalid Search Column.Check it now</message>
   </error>
   </response>

I perform a post request

1. https://crm.zoho.com/crm/private/xml/Accounts/getSearchRecordsByPDC?newFormat=1&apikey= APIKEY &ticket= TICKET

with these parameters

1. selectColumns=Accounts(Account Name,App Username)
   searchColumn=App Username
   searchValue=user.email@test.dom

Where is the error?

Thanks in advance

Elia