If Accumulator bits 3-0 are greater than nine (xxx1010-xxx1111), or if the AC flag is one, six is added to
the Accumulator

with a f132:

1)
with AC zero
mov a,#10
da a

result 1n 0x10 in the acc

2)
with AC set
mov a,#10
da a

result 1n 0x0a in the acc

3)
with AC zero
mov a,#07
da a

result 1n 0x07 in the acc

4)
with AC set
mov a,#07
da a

result 1n 0x07 in the acc

case 2 could be a double negative, case 4 is, as far as I can judge wrong.

why not try it in the Keil simulator

Erik