A case

[moon2007]

Hello,

Suppose that we have the follwoing steps to run a report:

1. user enters the mobile number
2. user presses the 'Report' button

Now i need to describe the case when the button is pressed and no mobile number is entered:

should i say:

If the 'Report' button is pressed while no mobile number is entered, system will raise the message: ' The Mobile Number must be entered'

or

If the 'Report' button is pressed while no mobile number was entered, system will raise the message: ' The Mobile Number must be entered'.

and what is the difference?

Thanks in advance..

[Tdol]

The second is wrong; it should be 'would'. The first implies that this has a reasonable chance of happening and the second (with 'would) that it is unlikely to happen.