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Variable Design 
This function allows you to design a variable as a combo box. If, for example, a sales representative needs to perform a search on “languages”, then it is more appropriate for the sales representative to select a language from a list of possible values, instead of entering the language manually.
You have created a variable for a criterion. For more information, see Variable Definition.
You can design a variable using any of the following types:
· Choice Field Combo
In this case, the variable’s values come from a choice field. You use a choice field when you want to provide a list of values to a mobile client user. When you choose Choice Field Combo, the Choice Field Key field is enabled. You must only specify the name of the choice field as the Choice Field Key.
· Hierarchical Choice Field Combo
In this option, a choice field has a hierarchy assigned to it. For example, a variable “Region” can belong to the hierarchy “Country”, then “Country” becomes the parent for “Region”.

You can also enter hierarchical choice field details using the Free Combo type.
You also specify the name of the choice field, the name of the parent field, and the column number of the parent field. The Higher-Lvl. Grid Column specifies the width of the column for the variable that will be displayed, while using the advanced selection in a mobile client application.
· Free Combo
In this option, the variable‘s values come from SAP R/3 or from CRM Enterprise. You specify the business document (BDoc) of the field, the segment field name and all the combo fields. The combo fields act as values for the combo box.
Additionally, you also indicate the parameters for the combo separated by a “ / ”. The standard hierarchy parameters are the client name “MANDT” and the language of the logged on user “SPRAS”. Using Free Combo you can also enter the details for:
¡ Choice Field Combo: In this case, you have to enter another parameter “LIST” along with the standard parameters.
¡ Hierarchical Choice Field Combo: In this case, you have to enter the parent choice field name and the child choice field name.
You also specify the:
¡ Hierarchy Fields
Specifies the values for the hierarchy parameters. Enter the hierarchy fields, separated by a “/”. You can enter “ * “ for the standard parameter values “SPRAS” and “MANDT”. The values you enter in case of choice field or hierarchical field combo parameters are within single quotations. Those values are transferred directly to the respective business document (BDoc).
¡ Key Combo Column No.
Specifies the column number, which holds the returned value, when using the advanced selection in a mobile client application. The number you enter should be greater or equal to 1. If you enter 0, then it will be replaced by 1.
¡ Visible
Indicates the flag for the Key Combo Column No. If you choose the checkbox the key combo column number will be hidden, else the column will be visible, while using the advanced selection in a mobile client application.