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Creating Variables for Quantity Conversion
Types 
When you create a quantity conversion type you can use a variable for the source and target unit of measure.
You have assigned the technical Content InfoObject Unit (0UNIT) to an InfoArea so that this InfoObject can be used as an InfoProvider.
...
1. Open the Query Designer.
2.
Create a new
query for the Unit (0UNIT) InfoObject. For more
information, see
Defining New
Queries.
3.
In the
context menu of the InfoObject, choose New Variable. The
variables wizard appears. Also see
Defining Variables
with the Variables Wizard .
4. Enter a variable name and a description for the variable.
5. Choose the required processing type in the Processing by field. If you choose User Entry/ Default Value, the system requests that you enter the unit of measure in a dialog box in the query.
6. Choose Continue. The Details screen appears. Here you decide how you want the entry to be displayed.
7. Choose Continue to assign a default value for the variable.
8. Choose Continue to get a summary of the properties of the variables.
9. Choose Exit. The variable is saved.
10. Leave the Query Designer.
The variable can be used in the quantity conversion type.