Using the Function operation Use the Function operation to select a function as the source data element. Select a source data element in the TML mapping. Click Operation and select Function. Click the browse button in the source data element. The Select Function dialog opens. Select a function. Specify the required parameter inputs. Optionally, you can select the input field value as the parameter value: Click the value type and change to Field. Expand the fields and select the input field. Click Use Selected Field. The selected field is displayed in the source data element, for example, SSC/Payload/Address/Address Code Click OK to close the dialog. The function parameter details are displayed in the source data element.