How much time/frequency error is introduced by the Custom Profile or Custom I/Q resampling?

The original equation that determines the number of resampled data points is shown below:

data_new = round(data_user x SR_pattern/SR_user)

We can not have fractional data points so the error is introduced when we round the number of data points to a whole number. Work backwards using the whole number of data points to determine the error.