The report is dedicated to the so-called subjective commercial deals as used is the comparative legal method of study. Reviewed are the preconditions for their qualification as commercial, set in S 343 of the German commercial legislator (Handelsgesetzbuch), which is a reception source of art. 286, par. 1 of the Bulgarian commercial act. Special attention is paid to the requirement for relation between the deal and the enterprise of the trader with regards to which there is no unity in the Bulgarian theory and court practice. Reviewed is also the rebuttable presumption for the presence of such relation under art. 286, par. 3 of Commercial Act.