Set a default Currency Lookup Value on a Form

• Open CRM and go to Settings, Business Management, Currencies
• Open the currency record and select F11 or Cntrl N to view the IE address field if you don’t already have it displayed
• Find the ID contained between the two brackets {}, copy the full value with bracktes and save it for use in the script

Next we’ll open the entity that we want to set with a default currency value.

• Go to Settings, Customization, Customize Entities and open the entity that you want to set the default currency
• Select Forms and Views from the left navigation menu
• Select Form properties from the right "Common Tasks" menu
• Select OnLoad and select Edit
• Copy and paste the script below into the ‘script area’ and check the Event Enabled selection
• Be sure to copy your Currency Guid into the appropriate place in the script
• Select the Dependencies Tab and move the Currency field to ‘Dependent Fields" list
• This will ensure that the field remains on the form
• Save, close and test your changes

You can publish your changes when you are satisfied with the result.  I obtained the code below from a CRM post responded to by uMar Khan.  Thanks uMar, for the assist!

if (crmForm.FormType == 1)

{

//Create an array to set as the DataValue for the lookup control.
var lookupData = new Array();

//Create an Object add to the array.
var lookupItem= new Object();

//Set the id, typename, and name properties to the object.
lookupItem.id = ‘{CopyYourCurrencyGuidHere}’;
lookupItem.typename = ‘transactioncurrency’;
lookupItem.name = ‘US Dollar’;

// Add the object to the array.
lookupData[0] = lookupItem;

// Set the value of the lookup field to the value of the array.
crmForm.all.transactioncurrencyid.DataValue = lookupData;
}