You cannot remove a test process from a test plan if data binding exists with another process or if the test plan has already been executed. Data binding is a feature that allows you to reuse data from one test process in another test process. If you remove a test process that has data binding with another process, you will break the data flow and cause errors. Therefore, you need to remove the data binding first before you can remove the test process. Similarly, if you have already executed the test plan, you cannot remove any test processes from it, as this would affect the test results and reports. You can only remove test processes from a test plan that has not been executed yet. The test plan user and the visibility of the test process are not relevant for removing a test process from a test plan.