in 2022 Turbo tax Standard version,   I entered the same amount of foreign capital gain  on box 21, I STILL GET ERROR. I called turbo tax technical support, they could not help to resolve this error

@dwchoi1668 Try deleting the T3 form and re-entering it, or try entering it in Forms mode.

The reply says enter the amount twice.  OK....where do I enter it the second time?

@ultinet1  Enter as "Foreign Capital Gains" and again as "Total Capital Gains".