नित्यं पणः परिमाणे

Operational rule vidhi

The affix अप् comes Invariably after the verb पण् 'to barter' when the sense is that of 'measure'.

Word by word (padaccheda)

Substitute / term नित्यम् prathamā · ekavacanaLeft context पणः pañcamī · ekavacanaRight context परिमाणे saptamī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
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").

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Full reading

नित्यम् पणः परिमाणे

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

Commentary

The affix अप् comes Invariably after the verb पण् 'to barter' when the sense is that of 'measure'.
The word नित्यं 'invariably' is used in the aphorism in order to stop the anuvritti of the word optionally. Thus मूलकपणः 'a handful of radishes'; शाकपणः 'a handful of vegetable'. These words secondarily have come to mean 'a measure equal to a handful', irrespective of any thing.

When not meaning measure, we have पणः 'trade'.

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