Bug: positionPda mismatch in initializePositionByOperator

[VladDunaev]

Description

initializePositionByOperator derives positionPda with one positionWidth value but invokes the program with another, causing a PDA mismatch and transaction failure.

Details

The initializePositionByOperator function derives positionPda using the provided positionWidth:

dlmm-sdk/ts-client/src/dlmm/index.ts

Lines 6423 to 6429 in 43e231e

	const [positionPda, _bump] = derivePosition(
	this.pubkey,
	base,
	lowerBinId,
	positionWidth,
	this.program.programId
	);

However, when calling the program method initializePositionByOperator, it uses DEFAULT_BIN_PER_POSITION instead of the provided positionWidth:

dlmm-sdk/ts-client/src/dlmm/index.ts

Lines 6445 to 6451 in 43e231e

	const initializePositionByOperatorTx = await this.program.methods
	.initializePositionByOperator(
	lowerBinId.toNumber(),
	DEFAULT_BIN_PER_POSITION.toNumber(),
	feeOwner,
	lockReleasePoint
	)

As a result, the on-chain program derives a different positionPda, leading to a transaction failure:

{
  "transactionMessage": "Transaction simulation failed: Error processing Instruction 0: custom program error: 0x7d6",
  "transactionLogs": [
    "Program LBUZKhRxPF3XUpBCjp4YzTKgLccjZhTSDM9YuVaPwxo invoke [1]",
    "Program log: Instruction: InitializePositionByOperator",
    "Program log: AnchorError caused by account: position. Error Code: ConstraintSeeds. Error Number: 2006. Error Message: A seeds constraint was violated.",
    "Program log: Left:",
    "Program log: 77Vr1EQF9TQZbTrGK9PRFZNz1ULUE1s4c1Bs5XHbcYXB",
    "Program log: Right:",
    "Program log: GkCgxJfRsH6Xhf84UB6QwDqizYnzkMeuEd8fsWPfPvhY",
    "Program LBUZKhRxPF3XUpBCjp4YzTKgLccjZhTSDM9YuVaPwxo consumed 11701 of 200000 compute units",
    "Program LBUZKhRxPF3XUpBCjp4YzTKgLccjZhTSDM9YuVaPwxo failed: custom program error: 0x7d6"
  ]
}

This indicates a mismatch between the client-side PDA derivation and the program’s expectation.

Suggested fix

Replace usage of DEFAULT_BIN_PER_POSITION with the provided positionWidth parameter when invoking the program method.