You probably copied a Surround SCM step from the Surround SCM.bld sample (which contains a projec macro SHOW_CMD set to 0) into another project. The steps in the sample use a
field override for the 'Show command-line constructed for call' field referencing the macro SHOW_CMD. Since that macro isn't defined in your project, VBP
prompts for its value.
To avoid prompting, you can either remove the field override for that field of the Surround SCM step or create a project macro with that name and a value of 0.