filemaker sales chart

hi, before i asked how to make individual sales chart.
i'm having trouble.
i have three table...product DB, invoice DB and invoice data DB.
since one invoice contain multiple product sales data, i made invoice data DB.
now i made a link between invoice data DB and product DB, trying to use SUM script...
but i said error... missing index... do you know how to solve this problem?
Hiroyuki TamuraField EngineerAsked:
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JoJohn2004Commented:
A missing index can be caused by not being able to index one of the fields that are being used as a key field in a relationship. A global cannot be indexed nor can an unstored value. Unstored calculated values will be any calculated field that is dependent on a global, a related field, or another unstored value.
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Hiroyuki TamuraField EngineerAuthor Commented:
thank you.
this is my sample file...
could you take a look?
https://filedb.experts-exchange.com/incoming/ee-stuff/3044-test1.zip 
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JoJohn2004Commented:
Create a sum field in Products total=Sum(invoice data::price)

You can then show this field either on the products page or within the portal on the appropriate portal line of the invoices layout.
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Hiroyuki TamuraField EngineerAuthor Commented:
thank you.
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