Change the Custom Form on View Mode via Script

Deploy the following script as a User Event script for Before Load Function on your desired Record type.

function changeform()
{
    var currentForm = request.getParameter('cf');
    if (nlapiGetContext().getExecutionContext() == 'userinterface' && type == 'view' && currentForm != '10') {


        var formId = 10; // Custom form Internal ID of the desired form
        nlapiSetRedirectURL('RECORD', nlapiGetRecordType(), nlapiGetRecordId(), false, {
            cf: formId
        });
    }
    return;
}

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