**This bug is reported by iamsarin.**
In previous versions, when using a Tax ID that starts with 0 (e.g. `0123456789012`), the first digit will be changed to 6 (it becomes `6123456789012`).
This happens because the algorithm assumes that if the target number starts with 0, it will be a local phone number, and replaces it with 66.
**v0.4.3 fixed this issue, in commit 742cd3486c7cefbfc71a3869b59cf72b5a1cedcd. Please upgrade as soon as possible.** Sorry for inconvenience.