You might, for example, write an entry/exit procedure that totals the weights of ordered items and calculates the appropriate shipping charge upon entry in a field. When you want the procedure to check a value that has been entered in a field, the value must be loaded into a variable, not a column. To load the value into a column, use an expression in the form to set the column equal to the variable.
The R:BASE SKIP command is designed for use with entry/exit procedures in forms. Use SKIP to tell R:BASE to skip over or skip back a specified number of fields, or skip to a specified field.
For example, the following entry/exit procedure tells the form to skip to the field with the column amount if there was any value in the variable vcashtype.