Unable to combine data - Please rebuild this data combination - Refresh

Hi PowerBi fans.

hope you can help me out. See picture below.

Trying to call aan WebAPI. Works fine without parameters. 

Using a parameter as a part of the URL works fine in desktop mode.

Problems start when trying to refresh the data in the PowerBi service enviroment.

Error: " [Unable to combine data] Section1/Verwachting 16 dagen/AutoRemovedColumns1 references other queries or steps, so it may not directly access a data source. Please rebuild this data combination."

When removing the paramater from the URL ==> refresh works fine.

Any help or hint will be greatly appreciated.

Best regards,

Wouter