Treas. Reg. § 1.1503(d)-7, Example 3
Domestic Use Limitation — Foreign Branch Separate Unit Owned Through a Partnership
P and S organize partnership PRSₓ, which owns a Country X foreign branch (FBₓ) and a U.S. branch. Because P’s and S’s indirect shares of FBₓ are individual foreign branch separate units that are combined and treated as a single separate unit of the P consolidated group, any dual consolidated loss attributable to FBₓ is subject to the domestic use limitation — it cannot offset income of P or S, or the group’s share of the U.S. source income earned through PRSₓ.
Treas. Reg. § 1.1503(d)-7, Example 3