Why does this calculated Quantity give wrong/unpredictable results?

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FAQ - GDI

Calculated quantities have the following limitations:

- The maximum size is 255 characters

- A calculated quantity may not refer another calculated quantity in dGB-GDI pre V2.7.2

- Formulas must be expressed in internal (SI) units

- When calculating 'minus a constant', the constant must be preceded by a space. Example: 'XX-3' should be 'XX- 3', or 'XX - 3'.

The command line utility 'calcqty' can be used to check whether a formula has a correct syntax (remember to place quotes around the formula as the UNIX shell will be eager to expand e.g. the '*'). calcqty will also give values to the used quantities so you can check the output value.

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