# Issue

**Title:** Stamp duty over-allocated when a purchase lot is sold in multiple parts

## Description
When a single purchase lot is partially sold across multiple disposals, the stamp duty allocated to each subsequent partial sale is incorrectly calculated. This leads to an over-allocation of the total stamp duty, exceeding

## Task

Modify the repository so that the issue described above is resolved. The task's test suite verifies your patch by applying it on top of the base commit `84cdbdc97389` and running the modified tests.