Service parameter set other parameters to null in SSRS

Question

I have a report with a multi param query that consumes a wcf service.

I set some params with some values:

@param1 = 1  
@param2 = 2  
@param3 = "some string"  

and report works fine but when I set @param4 = 1 or any other value, then

@param1 = null  
@param2 = null  
@param3 = null  

and report just uses @param4 value for the query.

I test the service from a wcf client and the response is right.

How can I find what happens with this param?. I'm using SSRS-2016.

Thanks a lot.

Answer 1

我正在向服务发送额外的参数，我删除了这些额外的参数并且工作正常。