Hi,
Try this. It will work. As mentioned, you need to use P for adding and char or string for concatenating.
: lv_text1 type p decimals 2,
lv_text2 type p decimals 2,
lv_sum1 type p decimals 2,
lv_sum2 type p decimals 2,
lv_text3 type string,
lv_sum1c type string,
lv_sum2c type string.
lv_text1 = '100.00'.
lv_text2 = '20.00'.
lv_sum1 = lv_text1 + lv_text2.
lv_text1 = '30.00' .
lv_text2 = '40.00'.
lv_sum2 = lv_text1 + lv_text2.
lv_sum1c = lv_sum1.
lv_sum2c = lv_sum2.
concatenate lv_sum1c lv_sum2c into lv_text3.
write lv_text3.