Landcape Material overlay tiling,No tiling on landscape material overlay

Hello Guys
hope you could help me. I wanted to add an overlay (png) to my landscape material. This overlay should appear just one time in the middle of the landscape. I tried to set the tiling mode on CLAMP but then the overlay doesnt show up. When i set the tiling mode to WRAP the overlay is tiled multiple times. Can anyone help me?
Greetings Lesuge


It worked with the clamp Tiling Method, i just had to rebuild the shader to see the changes