उभयप्राप्तौ कर्मणि

When the agent and the object of the action denoted by the words formed by कृत्-affixes, are both used in a sentence, in the object only, the 6th-Case-affix is employed and not in the agent (the object is put in the Genitive 6th-Case and not the Agent).
आश्चर्य्यो गवां दोहोऽगोपालकेन 'the milking of a cow without a cowherd is a wonder.' रोचते मे ओदनस्य भोजनं देवदत्तेन. 'The eating of rice by Devadatta pleases me;' पयसः पानं यज्ञदत्तेन 'the drinking of milk by Yajnadatta.'

Vart:- When the agent and object are both used, the agent is put in the instrumental, or genitive case, when, as some say, the krit terminations are of the feminine gender, or as others say, when the terminations are of any gender; as, विचित्रा जगतः कृतिर्हरेर्हरिणा वा 'the creation of the world by Hari is wonderful' शब्दानामनुशासनमाचार्य्येण आचार्यस्यवा 'the dissertation on words by the acharya' पवित्राहि सूत्रस्य कृतिः पाणिनेः or पाणिनिना वा 'beautiful is the structure of sutra by Panini.' Apte.