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Problem with changing value on specific date

Question asked by FraserBarry on Mar 19, 2014
Latest reply on Mar 19, 2014 by philmodjunk

Title

Problem with changing value on specific date

Post

     I am a first time  user of this forum.  I am new to FileMaker Pro however I have recently completed a personal database for billing of services to my local hospital.  

     Each service has a total amount of units.  The service cost is the total units *$36.85.   This unit value increases by 3% on the 1st of November each year.   Obviously by changing this figure in the calculation will change all previously entered services. I have tried making a unit cost table and using a Lookup.   I know with a Lookup any change to the value in the table won't change any previous services   For some reason  I can't get this to work, it keeps returning an empty field .   Is it possible to right a script for the unit price field?

     Appreciate that it is probably  an easy fix .

     Fraserb

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