This has been fixed in Lacerte:

Voluntary federal income tax withheld (SSA-1099/ RRB-1099)

Enter any federal income tax withheld from an SSA-1099 or RRB-1099 in this field.

NOTE: Do not use the “Federal income tax withheld [A]” field (codes 14 and 64) in this screen to enter SSA-1099 or RRB-1099 withholding any longer.