yes ADDWT will not add the wage type if the amount is zero.
1 - Yes, if the WT has no rate (RTE), number (NUM) or amount (AMT), it will not be transfered into the Results Table (RT), but it can if it has a value in one of these three fields.
2 - Yes, if you made sure that the WT has no rate, number or amount, you could terminate your PCR without operation ADDWT.
