The cu processing code allows data in a defined attribute with an output-conversion (attribute 7) or correlative (attribute 8) to be changed character by character with the Update processor. The cu processing code is placed in the input-conversion (attribute 14). If cu is not specified, existing data is erased and nulled when editing is started.
| System Processors | Update |
| Code Type | Attribute Defining |
| Dictionary Attributes | Input Conversion |
cu
The cu processing code is required only when there is another conversion present in the attribute-defining item. For example, having a cu processing code within an attribute that contains a date and a corresponding d output-conversion code in its attribute-defining item allows changing part of the date field, rather than having to re-enter the entire date.