I'm no genius but (6-5)*10000 should be 10000 and 5 is between 0 and 10,000 
I think....

Pstart:GHzPstop:GHzPoints:
enter an integer between 0 and -49995
GHz
from decimal import *
def loadpull_points_in_range(pstop, pstart):
    return IS_INT_IN_RANGE(0,
                    int(Decimal(pstop)-Decimal(pstart)*10000))

db.define_table('loadpull',
              .
              .
              .
    Field('pstart', 'decimal(6,4)',
            requires=IS_DECIMAL_IN_RANGE(0, 300), 
            comment='GHz'),
    Field('pstop', 'decimal(6,3)',
            requires=IS_DECIMAL_IN_RANGE(0, 300), 
            comment='GHz'),
    Field('points', 'integer',
            comment='GHz'),
    auth.signature,
    format='%(name)s',
    migrate=settings.migrate)
db.loadpull.points.requires=loadpull_points_in_range(request.vars.pstop, 
request.vars.pstart)
########################################


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