हिरण्यपरिमाणं धने

Operational rule vidhi

The first member denoting the quantity of gold retains optionally its original accent before the word धन.

Word by word (padaccheda)

Substitute / term हिरण्यपरिमाणम् prathamā · ekavacanaRight context धने saptamī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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").

Full reading

हिरण्यपरिमाणम् धने

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

Commentary

The first member denoting the quantity of gold retains optionally its original accent before the word धन।
Thus द्विसुवर्ण꣡ धनम् or द्विसुवर्णधन꣡म् ॥ This is a Karmadharaya compound द्वौसुवर्णौ परिमाणमस्य = द्विसुवर्णं, तदेव धनम् ॥ It may also be treated as a Bahuvrihi compound, then the accent will be of that compound, as द्वि꣡सुवर्णधनः or द्विसुवर्णधनः꣡ ॥ Why do we say 'gold'? Observe प्रस्थधनम् ॥ Why do we say 'quantity'? Observe कांचनधनम् ॥ Why do we say 'धन'? Observe निष्कमाला ॥

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