From 5766fe79327c6e835ce2b560729f3a08c3390eb5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Torsten=20Stu=CC=88ber?=
 <15174476+TorstenStueber@users.noreply.github.com>
Date: Tue, 9 Dec 2025 19:23:43 -0300
Subject: [PATCH 1/3] Derive extra traits for fungibles::Imbalance

---
 .../src/traits/tokens/fungibles/imbalance.rs  | 26 ++++++++++++++-----
 1 file changed, 19 insertions(+), 7 deletions(-)

diff --git a/substrate/frame/support/src/traits/tokens/fungibles/imbalance.rs b/substrate/frame/support/src/traits/tokens/fungibles/imbalance.rs
index 349d9d7c65e89..f4ecece79d92a 100644
--- a/substrate/frame/support/src/traits/tokens/fungibles/imbalance.rs
+++ b/substrate/frame/support/src/traits/tokens/fungibles/imbalance.rs
@@ -21,12 +21,15 @@
 //! See the [`crate::traits::fungibles`] doc for more information about fungibles traits.
 
 use super::*;
-use crate::traits::{
-	fungible,
-	misc::{SameOrOther, TryDrop},
-	tokens::{
-		imbalance::{Imbalance as ImbalanceT, TryMerge},
-		AssetId, Balance,
+use crate::{
+	pallet_prelude::{Decode, DecodeWithMemTracking, Encode, MaxEncodedLen, TypeInfo},
+	traits::{
+		fungible,
+		misc::{SameOrOther, TryDrop},
+		tokens::{
+			imbalance::{Imbalance as ImbalanceT, TryMerge},
+			AssetId, Balance,
+		},
 	},
 };
 use core::marker::PhantomData;
@@ -45,7 +48,16 @@ pub trait HandleImbalanceDrop<AssetId, Balance> {
 ///
 /// Importantly, it has a special `Drop` impl, and cannot be created outside of this module.
 #[must_use]
-#[derive(EqNoBound, PartialEqNoBound, RuntimeDebugNoBound)]
+#[derive(
+	EqNoBound,
+	PartialEqNoBound,
+	RuntimeDebugNoBound,
+	Encode,
+	Decode,
+	DecodeWithMemTracking,
+	MaxEncodedLen,
+	TypeInfo,
+)]
 pub struct Imbalance<
 	A: AssetId,
 	B: Balance,

From fd822cbb408b7738d757b6d15652c4975cbb675f Mon Sep 17 00:00:00 2001
From: "cmd[bot]" <41898282+github-actions[bot]@users.noreply.github.com>
Date: Tue, 9 Dec 2025 22:31:27 +0000
Subject: [PATCH 2/3] Update from github-actions[bot] running command 'prdoc
 --audience runtime_dev --bump patch'

---
 prdoc/pr_10587.prdoc | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 prdoc/pr_10587.prdoc

diff --git a/prdoc/pr_10587.prdoc b/prdoc/pr_10587.prdoc
new file mode 100644
index 0000000000000..e89a28e58c0be
--- /dev/null
+++ b/prdoc/pr_10587.prdoc
@@ -0,0 +1,10 @@
+title: Derive extra traits for fungibles::Imbalance
+doc:
+- audience: Runtime Dev
+  description: |-
+    This PR adds the same derived traits to `fungibles::Imbalance` that are already derived for `fungible::Imbalance`.
+
+    This is required so that the `OnChargeTransaction` configuration of `pallet_transaction_payment` can work for the `fungibles` version of types/traits (it already works for `fungible`).
+crates:
+- name: frame-support
+  bump: patch

From dcd515a3f2b875ad98803deb623666a09c776ca1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Torsten=20Stu=CC=88ber?=
 <15174476+TorstenStueber@users.noreply.github.com>
Date: Tue, 9 Dec 2025 20:15:55 -0300
Subject: [PATCH 3/3] Implement Default for fungibles::Imbalance

---
 .../support/src/traits/tokens/fungibles/imbalance.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/substrate/frame/support/src/traits/tokens/fungibles/imbalance.rs b/substrate/frame/support/src/traits/tokens/fungibles/imbalance.rs
index f4ecece79d92a..3c4bd149d5472 100644
--- a/substrate/frame/support/src/traits/tokens/fungibles/imbalance.rs
+++ b/substrate/frame/support/src/traits/tokens/fungibles/imbalance.rs
@@ -96,6 +96,18 @@ impl<
 	}
 }
 
+impl<
+		A: AssetId + Default,
+		B: Balance,
+		OnDrop: HandleImbalanceDrop<A, B>,
+		OppositeOnDrop: HandleImbalanceDrop<A, B>,
+	> Default for Imbalance<A, B, OnDrop, OppositeOnDrop>
+{
+	fn default() -> Self {
+		Self::zero(Default::default())
+	}
+}
+
 impl<
 		A: AssetId,
 		B: Balance,