नेतराच्छन्दसि

Operational rule vidhi

In case of Vedas - The सुँ and अम् प्रत्यय occurring after the नपुंसकलिङ्गवाची 'इतर' शब्द do not get the अद्ड्-आदेशः .

Word by word (padaccheda)

Indeclinable न avyayaLeft context इतरात् pañcamī · ekavacanaRight context छन्दसि saptamī · ekavacana

Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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

न इतरात् छन्दसि

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

Commentary

In the छन्दस् (Vedas) अत् (or अद्) is not the substitute of सु and अम् Nominative 1st-Case and Accusative -2nd case endings after इतर।
As इतरमितरमण्डमजायत; वार्त्रघ्नमितरम् ॥ Why in the Vedas? See इतरत् काष्ठम्, इतरत् कुड्यम् ॥ Had this sutra been placed immediately after अतोऽम् 7.1.24, we could have made it simpler by saying इतराच्छन्दसि; the present position of the sutra indicates that we should divide it into two, to include other cases. In the case of एकतर, the अदड् substitution does not take place, either in the Veda or in the Common Language. As एकतरं तिष्ठति, एकतरं पश्य ॥

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