Is there a bug in TxtCharIsDigit?

[Roberto Amorim]

I'm trying to use TxtCharIsDigit:

char ch;

if (TxtCharIsDigit(ch))  ... ;

CW R6 shows this error message:

Error: undefined identifier '_DI'
pv.c line 504 ((txtCharAttr(ch) $_DI) != 0)

What can be wrong?

TIA

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