Custom function for custom Button to create new record in different custom module

Hey,

I was trying to implement a custom button into our CRM which should create a record in a custom module, called "Customers" (API Name "Customers"). The button is in the module "Opportunities" (API Name "Deals"). Clicking on that Button a new record in Customers should be created using the Account Name from the Opportunity record as Customer Name.

I was trying different functions i found online but none of them seem to create a new record. I do get the "success" popup when i click the button but no new record is beeing cerated.

Maybe you can help me:

Argument: dealId = Opportunity - Opportunity Id

dealDetails = zoho.crm.getRecordById("Deals",dealId.toLong());

info dealDetails;

mp = Map();

mp.put("Name",ifnull(dealDetails.get("Account_Name"),""));

mp.put("Customers",dealId);

create = zoho.crm.createRecord("Customers",mp);

info mp;

info create;

return "success";

Many Thanks in advance.