I have few investment plans with a fixed amount of euros per month. My broker does not support fractional shares, so e.g. if I buy 800 EUR of a stock which is 101 per share, I buy 7 with an expense of 707. PP instead records automatically 7,92, and each month I have to change all the automated transactions with the exact number of shares.
I have the same problem. I tried but i think the best solution is re-Edit it manually ( it cost some seconds because you have to modify the fields already created by PP).