In Germany a declaratory action is an established instrument to react to an unwarranted warning letter. But whether it is necessary to send a counter-warning in response to a first warning letter so as to prevent an award of costs pursuant to S 93 ZPO (Code of Civil Procedure) when filing a declaratory action has up to now been a moot point. Different courts have handed down different decisions on this point. The District Court of Cologne confirmed the necessity of a counter-warning letter to prevent an award of costs pursuant to S 93 ZPO. Several Higher Regional Courts, however, denied the basic necessity of sending a counter-warning letter.