कन्यायां समानजातीयादपत्यमुत्पाद्य वाभिषिञ्चेत् ॥ कZ_०५.६.४० ॥
kanyāyāṃ samānajātīyād apatyam utpādya vābhiṣiñcet
Or, by having a child begotten on the royal daughter by a man of equal status, he should have (the successor) consecrated/crowned.
A gap in male succession: it offers a lineage-preserving route to produce and enthrone a legitimate successor when only a royal daughter is available.