Add link to contact record in voucher record.

when a booking is occurred, a voucher get generated.

On the voucher record the field contact name field should be linked to the contact record then.

Create a new field under the custom voucher record as list type then select the contact as its value

	bookVoucher: function (voucherId, archType, formValues, validDate, expressVoucherPair, voucherPairId, validDispatchDate, internalReturnDate) {
				var voucher = null;
				var voucherInfo = { updatedVoucherId: 0, updatedVoucherName: '' }; //1.2.0

				try {
					if (!voucherPairId) //1.3.0
					{
						voucherPairId = '';
					}
					var contactSearch = nlapiSearchRecord("contact", null,
					[
						["entityid", "is", formValues.treatingDentist]
					],
					[
						new nlobjSearchColumn("entityid").setSort(false),
						new nlobjSearchColumn("email"),
						new nlobjSearchColumn("internalid")
					]
				);
                var contactid = contactSearch[0].getValue('internalid');
			
					voucher = nlapiLoadRecord('customrecord_voucher', voucherId);
					voucher.setFieldValue('custrecord_cust_vou_status', bookedStatus); //1.3.0
					voucher.setFieldValue('custrecord_patient_first_name', formValues.firstName);
					voucher.setFieldValue('custrecord_patient_last_name', formValues.lastName);
					voucher.setFieldValue('custrecord_cust_special_inst', formValues.specialInstruction);
					voucher.setFieldValue('custrecord_patient_dob', formValues.dateOfBirth);
					voucher.setFieldValue('custrecord_cust_express', 
					voucher.setFieldValue('custrecord_treating_dentist', contactid);
					voucher.setFieldValue('custrecord_bookedby', formValues.bookedBy); //1.4.2 Set the Booked By Field - RD // 1.4.3 DW



					voucherInfo.voucherName = voucher.getFieldValue('name'); //1.2.0
					voucherInfo.voucherId = nlapiSubmitRecord(voucher, false, true); //1.2.0
				} catch (e) {
					Library.errorHandler('Lab.BookPatient.Model', 'bookVoucher', e);
					this.bookingError = true;
				}
				return voucherInfo; //1.2.0
			}