In VASP 6.4.3 and with ISYM = 2, the code appears to strictly enforce the Acoustic Sum Rule (ASR) by shifting the sum of Born Effective Charges to exactly zero, which is physically incorrect for charged cells.
Incorrect Enforcement on Born Effective Charges in Charged Cells
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junyong_kang1
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henrique_miranda
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Re: Incorrect Enforcement on Born Effective Charges in Charged Cells
Thank you for reporting this issue.
I will look into it and implement a patch.