diff --git a/prdoc/pr_6267.prdoc b/prdoc/pr_6267.prdoc
new file mode 100644
index 000000000000..c218e2a5093b
--- /dev/null
+++ b/prdoc/pr_6267.prdoc
@@ -0,0 +1,135 @@
+# Schema: Polkadot SDK PRDoc Schema (prdoc) v1.0.0
+# See doc at https://raw.githubusercontent.com/paritytech/polkadot-sdk/master/prdoc/schema_user.json
+
+title: Allow configurable number of genesis accounts with specified balances for benchmarking.
+
+doc:
+  - audience: Runtime Dev
+    description: |
+      This pull request adds an additional field `dev_accounts` to the `GenesisConfig`
+      of the balances pallet, feature gated by `runtime-benchmarks`.
+
+      Bringing about an abitrary number of derived dev accounts when building the genesis
+      state. Runtime developers should supply a derivation path that includes an index placeholder
+      (i.e. "//Sender/{}") to generate multiple accounts from the same root in a consistent
+      manner.
+
+crates:
+  - name: substrate-test-runtime
+    bump: minor
+  - name: pallet-vesting
+    bump: minor
+  - name: pallet-utility
+    bump: minor
+  - name: pallet-tx-pause
+    bump: minor
+  - name: pallet-treasury
+    bump: minor
+  - name: pallet-transaction-storage
+    bump: minor
+  - name: pallet-transaction-payment
+    bump: minor
+  - name: pallet-asset-conversion-tx-payment
+    bump: minor
+  - name: pallet-asset-tx-payment
+    bump: minor
+  - name: pallet-tips
+    bump: minor
+  - name: pallet-state-trie-migration
+    bump: minor
+  - name: pallet-staking
+    bump: minor
+  - name: pallet-society
+    bump: minor
+  - name: pallet-safe-mode
+    bump: minor
+  - name: pallet-root-offences
+    bump: minor
+  - name: pallet-revive
+    bump: minor
+  - name: pallet-revive-mock-network
+    bump: minor
+  - name: pallet-referenda
+    bump: minor
+  - name: pallet-recovery
+    bump: minor
+  - name: pallet-proxy
+    bump: minor
+  - name: pallet-preimage
+    bump: minor
+  - name: pallet-nis
+    bump: minor
+  - name: pallet-multisig
+    bump: minor
+  - name: pallet-lottery
+    bump: minor
+  - name: pallet-indices
+    bump: minor
+  - name: pallet-identity
+    bump: minor
+  - name: pallet-grandpa
+    bump: minor
+  - name: pallet-fast-unstake
+    bump: minor
+  - name: pallet-elections-phragmen
+    bump: minor
+  - name: pallet-election-provider-multi-phase
+    bump: minor
+  - name: pallet-democracy
+    bump: minor
+  - name: pallet-delegated-staking
+    bump: minor
+  - name: pallet-conviction-voting
+    bump: minor
+  - name: pallet-contracts
+    bump: minor
+  - name: pallet-contracts-mock-network
+    bump: minor
+  - name: pallet-collective
+    bump: minor
+  - name: pallet-child-bounties
+    bump: minor
+  - name: pallet-bounties
+    bump: minor
+  - name: pallet-balances
+    bump: minor
+  - name: pallet-babe
+    bump: minor
+  - name: pallet-asset-conversion
+    bump: minor
+  - name: pallet-alliance
+    bump: minor
+  - name: node-testing
+    bump: minor
+  - name: xcm-simulator-fuzzer
+    bump: minor
+  - name: xcm-simulator-example
+    bump: minor
+  - name: xcm-runtime-apis
+    bump: minor
+  - name: staging-xcm-builder
+    bump: minor
+  - name: pallet-xcm
+    bump: minor
+  - name: westend-runtime
+    bump: minor
+  - name: rococo-runtime
+    bump: minor
+  - name: polkadot-runtime-common
+    bump: minor
+  - name: parachains-runtimes-test-utils
+    bump: minor
+  - name: collectives-westend-runtime
+    bump: minor
+  - name: bridge-hub-westend-runtime
+    bump: minor
+  - name: bridge-hub-rococo-runtime
+    bump: minor
+  - name: asset-hub-westend-runtime
+    bump: minor
+  - name: asset-hub-rococo-runtime
+    bump: minor
+  - name: pallet-collator-selection
+    bump: minor
+  - name: pallet-bridge-messages
+    bump: minor
diff --git a/substrate/frame/balances/src/lib.rs b/substrate/frame/balances/src/lib.rs
index 26154ae66793..c79ea186487a 100644
--- a/substrate/frame/balances/src/lib.rs
+++ b/substrate/frame/balances/src/lib.rs
@@ -183,6 +183,7 @@ use sp_runtime::{
 
 #[cfg(feature = "runtime-benchmarks")]
 use sp_core::{sr25519::Pair as SrPair, Pair};
+use alloc::{format, string::{String, ToString}};
 
 pub use types::{
 	AccountData, AdjustmentDirection, BalanceLock, DustCleaner, ExtraFlags, Reasons, ReserveData,
@@ -1288,6 +1289,11 @@ pub mod pallet {
 				"the balance of any account should always be at least the existential deposit.",
 			);
 
+			assert!(
+				derivation.contains("{}"),
+				"Invalid derivation string"
+			);
+
 			for index in 0..num_accounts {
 				// Replace "{}" in the derivation string with the index.
 				let derivation_string = derivation.replace("{}", &index.to_string());
@@ -1298,10 +1304,10 @@ pub mod pallet {
 
 				// Convert the public key to AccountId.
 				let who = T::AccountId::decode(&mut &pair.public().encode()[..])
-					.expect(&format!("Failed to decode public key from pair: {}", pair.public()));
+					.expect(&format!("Failed to decode public key from pair: {:?}", pair.public()));
 
 				frame_system::Pallet::<T>::inc_providers(&who);
-				// Insert the account into the store and ensure it succeeds.
+				// Insert the account into the store and ensure it succeeds(uri).
 				assert!(T::AccountStore::insert(
 					&who,
 					AccountData { free: balance, ..Default::default() }
diff --git a/substrate/frame/transaction-payment/asset-conversion-tx-payment/src/tests.rs b/substrate/frame/transaction-payment/asset-conversion-tx-payment/src/tests.rs
index 6ce4652fd42f..76d46aa16471 100644
--- a/substrate/frame/transaction-payment/asset-conversion-tx-payment/src/tests.rs
+++ b/substrate/frame/transaction-payment/asset-conversion-tx-payment/src/tests.rs
@@ -86,6 +86,7 @@ impl ExtBuilder {
 			} else {
 				vec![]
 			},
+			..Default::default()
 		}
 		.assimilate_storage(&mut t)
 		.unwrap();
diff --git a/substrate/frame/transaction-payment/src/tests.rs b/substrate/frame/transaction-payment/src/tests.rs
index 572c1d4961dd..1132aa4cf84a 100644
--- a/substrate/frame/transaction-payment/src/tests.rs
+++ b/substrate/frame/transaction-payment/src/tests.rs
@@ -99,6 +99,7 @@ impl ExtBuilder {
 			} else {
 				vec![]
 			},
+			..Default::default()
 		}
 		.assimilate_storage(&mut t)
 		.unwrap();