From 7f4f2bc234e551ab46438446bb755eaedb40c4e5 Mon Sep 17 00:00:00 2001
From: Stephen Fraser <stephen.fraser@digirati.com>
Date: Mon, 6 Jul 2026 12:21:31 +0100
Subject: [PATCH] Added backgroundColour property for P4 compat

---
 src/presentation-3/serialize-presentation-3.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/presentation-3/serialize-presentation-3.ts b/src/presentation-3/serialize-presentation-3.ts
index b619b9e..2702999 100644
--- a/src/presentation-3/serialize-presentation-3.ts
+++ b/src/presentation-3/serialize-presentation-3.ts
@@ -25,6 +25,8 @@ function technicalProperties(entity: Partial<TechnicalProperties>): Array<[keyof
     ['behavior', entity.behavior && entity.behavior.length ? entity.behavior : undefined],
     ['timeMode', entity.timeMode],
     ['motivation', Array.isArray(entity.motivation) ? entity.motivation[0] : entity.motivation],
+    // Presetntation 4 compat.
+    ['backgroundColor', (entity as any).backgroundColor || undefined] as any,
     [HAS_PART as any, UNSET],
   ];
 }