Bentley PULS, the boundary condition "variable velocity function"

In Bentley PULS, the boundary condition "variable velocity function" file contains three columns of data for frequencies (Hz), amplitudes (m3/sec) and phase angles (degrees).  I create a txt file with the data as follows (the basic frequency is 7 Hz):

7          1.194556898          286.4862694
14       0.827947277          29.5432035
21       0.422198951          299.9924041
28       0.218152869          352.3062204
35       0.225977731          51.23399186
42       0.182952947          308.609774
49       0.127972776          8.304224257
56       0.129790765          66.81201707
63       0.118392548          320.1440529
70       0.09216643             23.52828533

1st columns of data is for frequencies (Hz), 2nd columns of data is for velocity amplitudes (m3/sec) and 3rd columns of data is for phase angles.

When I read in the data file. No warnings or errors was found in the check process. But when I run the calculation, input error shows:

File Variable Vel not found.

How can I solve this problem ? How can I read in the variable velocity function file?

Thanks!