Bayern Munich coach Jurgen Klinsmann and Hamburg counterpart Martin Jol have called for consistency from referees as they clamp down on shirt-tugging inside the penalty area this season.
Thorsten Kinhofer awarded each side a penalty which would probably not have been given last season as he applied the letter of the law in the Bundesliga's opening fixture - Friday night's 2-2 draw in Bavaria.
First, he pointed to the spot as Joris Mathijsen clashed with Bastian Schweinsteiger to allow Bayern to go 2-0 ahead and then he reciprocated in the same penalty area in the second half as Christian Lell came together with Ivica Olic.
'I didn't think either was a penalty, so ours balanced it out,' commented Jol.
'Hopefully, referees will be consistent with this.'
Klinsmann admitted he had spoken to his players about the likely enforcement of the rule before the game, but felt both decisions could have gone either way.
'We had touched on it, but sometimes they are given and sometimes they are not,' he said.
'I think the referees have got to be courageous to give those penalties and we have got to accept it.'
Bayern captain Mark van Bommel added: 'We have been gifted a second goal, but if that one was right to be given, then they were both right to be given.'
The rest of the Bundesliga will have taken note as they prepare for action on Saturday and Sunday with defenders particularly under pressure to respect the new, or at least newly-assessed, rule.