Schedule Analysis workbook with prompts

Hi guys,

Is anyone able to use prompts in the schedule of an Analysis Office workbook?

I hava a mandatory prompt in my BEx query : Z_CALMONTH, which is used to filter on a specific calendar month

When I schedule the workbook I enter the following settings in the prompts area:

Datasource: DS_1

Variable: Z_CALMONTH

Value: 09.2015

However, my data is not filtered in the report.

Two things happen:

when I save the value of the variable in my report - the schedule returns the old data

when I save don't save the value of the variable - the schedule gets an error.

Anyone know if I miss any settings?

Kind regards,

Dwain