The recommendation was removed from an early draft of the institute's revised code on face-to-face fundraising when the public consultation was issued earlier this year (Third Sector Online, 13 May).
Mick Aldridge, chief executive of the PFRA, wrote a letter of protest to the institute about the omission of the statement and succeeded in getting it put back in.
"We can satisfy our stakeholders that robust and effective self-regulation will be applied and upheld by the PFRA, which is what we were originally set up by the institute to do," he said.
Megan Pacey, director of policy and campaigns at the institute, said the decision was made after considering all consultation responses.
The code also incorporates guidance on prospecting, whereby contact details but no money is solicited from people.