how to update calculated fields

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Hi,



ive got a problem with updating calculated fields.

Normally the mail merge fields get updated before printing (as set in the options), but the calculated fields won´t.

I´m doing the mail merge with an open xml component (not word) and use mergefields to calculate some values.
e.g.
{ ={MERFEFIELD a} + {MERGEFIELD b}}

The result is:
{ =12 + 4} so the math can be done by word.

The openxml component is not working perfectly so the shown text for the result is: syntax error.

If i update the field manually (either by clicking on a single field or selecting all fields an clicking update fields) the math is done by word again and the text is updated correctly.
My problem is that i need to print these documents without updating them manually. Is there an option i´am missing? I can´t use any vba scripts.

See also the attached example document.