Manual prompt in BO

Hi.

We are using a query of BW.

In the query we have 0FISCPER(Fiscal year / period), it is empty in the cube.

We write an Fiscal year / period when the query is executed and I have created a exit variable that fill me last day of the month of this Fiscal year / period. Object 0FISCPER(Fiscal year / period), it is empty in the cube.

Webi's report, in BO it shows filter of Fiscal year / period of my query in BW but it is empty so this list doesn´t show nothing and I cannot select nothing.

I would like to be able to write the Prompt manually in Webi, I want to write values and not selecting it of a list.

Can Somebody help me?

Thank you