The 6th-Case-affix is used after a word, in denoting the agent and the object, when used along with a word ending with a kṛt-affix --kṛdatiṅ [[3.1.93]].,
Ex. क्रियां कालिदासस्य 'the composition of Kalidasa.' आहता क्रतूनां 'the performer of sacrifice.' So also भवतः शायिका 'your turn of lying down.' अपां स्रष्टा, पुरां भेत्ता वज्रस्य भर्त्ता. But not in शस्त्रेण भेत्ता 'cutting with weapon.'
Why do we say 'krit?' Not so when a Taddhita-affix is employed as कृतपूर्वीकटं. In other words, the genitive in Sanskrit is both subjective and objective.,