तत्पुरुषे कृति बहुलम्

Operational rule vidhi

In a तत्-पुरुष समास when the second member is a word formed with a कृत् affix the Locative -7th case ending is optionally preserved.

Word by word (padaccheda)

Right context saptamī · ekavacanaRight context saptamī · ekavacanaSubstitute / term बहुलम् prathamā · ekavacana

Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.

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Full reading

बहुलम्

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

In a तत्-पुरुष समास when the second member is a word formed with a कृत् affix the Locative -7th case ending is optionally preserved.
As स्तम्बेरमः, कर्णेजपः, but also कुरुचरः, मद्रचरः ॥

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.