Normally you don't have to give verbals for rule breaks, usually for RDM or RDA but for something this minor the warning is over the top.
He could of easily removed it and told you not to build there, the warning wasn't necessary.

Normally you don't have to give verbals for rule breaks, usually for RDM or RDA but for something this minor the warning is over the top. He could of easily removed it and told you not to build there, the warning wasn't necessary.