## 4.2.15.12.2.2  Changing a Unit of Measurement
Use method UPDATE to change a unit of measurement.
##  Caution
Changing the initial set of configurations has implications. Before proceeding with any change, familiarize yourself with the warnings in Units of Measurement [page 1517].
## Import Parameters
| Parameter Name   | Field Name   | Value Help                                                                               |
|------------------|--------------|------------------------------------------------------------------------------------------|
| UNIT             |              | Internal unit of measurement                                                             |
| UNIT_UPD_TS      |              | Structure for updating a unit of meas- urement                                           |
|                  | COMMERCIAL   | Commercial/external measurement unit format                                              |
|                  | TECHNICAL    | Technical measurement unit format                                                        |
|                  | DEC_ROUND    | Number of decimal places to which this measurement unit should be rounded for conversion |
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| Parameter Name   | Field Name      | Value Help                                                                                                          |
|------------------|-----------------|---------------------------------------------------------------------------------------------------------------------|
|                  | NUMERATOR       | Numerator for conversion to SI unit                                                                                 |
|                  | DENOMINATOR     | Denominator for conversion into SI unit                                                                             |
|                  | EXPONENT        | Base ten exponent for conversion to SI unit                                                                         |
|                  | CONSTANT        | Additive constant for conversion to SI unit                                                                         |
|                  | DEC_DISP        | Number of decimal places with which this measurement unit is displayed                                              |
|                  | ISOCODE         | ISO code for measurement units. An ISO code can be assigned to several internal measurement units of a dimen- sion. |
|                  | PRIMARY         | Unit of measure flagged as a primary unit for an ISO code Space : Not primary 'X' : Set as primary                  |
|                  | TEXT            | Description of a unit of measurement                                                                                |
|                  | LONG_TEXT       | Long description of a unit of measure- ment                                                                         |
|                  | ISCOMMERCIAL    | Flag for commercial measurement units                                                                               |
|                  | ISVALUEBASE     | Value-based commitment indicator                                                                                    |
|                  | ISGRPBYFAM      | Measurement units grouped by family                                                                                 |
|                  | TEMPERATURE     | Temperature value                                                                                                   |
|                  | TEMPERATUREUNIT | Temperature unit                                                                                                    |
|                  | PRESSURE        | Pressure value                                                                                                      |
|                  | PRESSUREUNIT    | Pressure unit                                                                                                       |
## Export Parameters
Parameter Name
ERROR
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##  Note
Class exception CX\_UOM\_ERROR is raised to check the integrity of the data import parameters.
##  Sample Code
```
CLASS zcl_uom_unit_update_test DEFINITION PUBLIC FINAL CREATE PUBLIC. PUBLIC SECTION. INTERFACES if_oo_adt_classrun. PROTECTED SECTION. PRIVATE SECTION. ENDCLASS. CLASS zcl_uom_unit_update_test IMPLEMENTATION. METHOD if_oo_adt_classrun~main. DATA(lo_uom) = cl_uom_maintenance=>get_instance( ). TRY. lo_uom->read( EXPORTING  unit       = 'ZYX' IMPORTING unit_st = DATA(ls_unit) ). DATA(ls_upd_unit) = VALUE cl_uom_maintenance=>ty_uom_upd_ts( BASE CORRESPONDING #( ls_unit ) commercial   = 'ZYA' technical    = 'ZYA' denominator  = '1' numerator    = '1' dec_disp     = '5' long_text    = 'Updates Unit' text         = 'Upd Unit' ). lo_uom->update( EXPORTING unit        = 'ZYX' unit_upd_ts = ls_upd_unit IMPORTING error      = DATA(lv_error) ). CATCH cx_uom_error INTO DATA(lo_error). out->write( |Exception raised| ). out->write( lo_error->get_text( ) ). ENDTRY. IF lv_error = abap_true. out->write( |Error occurred while updating the data in the database| ). ENDIF. ENDMETHOD. ENDCLASS.
```
## Value Help
Space
: No error
'X'
: Save error