क्र्यादिभ्यः श्ना

Operational rule vidhi

A verb belonging to the क्र्यादिगण gets the विकरणप्रत्यय 'श्ना' in presence of a सार्वधातुक प्रत्यय in कर्तरि प्रयोग.

Word by word (padaccheda)

Left context क्र्यादिभ्यः pañcamī · bahuvacanaWord श्ना

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Word Case not marked in the source data.

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Full reading

क्र्यादिभ्यः श्ना

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

Commentary

The affix श्ना comes after the roots of the क्र्यादिगणः (9th Conjugation) when a सार्वधातुक affix follows denoting the agent.
This debars शप्. As क्री + श्ना + तिप् = क्रीणाति 'he buys'. So also प्रीणाति 'he pleases'.

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