Blank Values in Variable Values- IP

Hi All,

I'm using Workbook for my Planning Application.

My scenario is

if im Filtering Material and customer then when i try to execute any planning sequence then it should executed.

If im giving only material and then execute the planning sequence then all customers with that material should be executed.

Currently this is working fine if i give both material and customer in the filter. but its not getting executed if i give only material leaving customer as blank.

From back end everything works fine. but this is not working from Workbook.

Im trying hard to understand how to extract all values if Particular customer is not filtered.

Below is the cell reference which i have which is causing an issue

VAR_NAME_1 = 0CUSTOMER

VAR_VALUE_EXT_1 = ( This should pick all values if we didnt filter any customer).

Let me know if some one has answer for this

Thanks

Dhinesh.