@td gives /OV

[Robert Repko]

Sorry, I sent the message by accident

Running filePro 5.7.00.04R4 on SCO Unix 5.0.7
In a processing table I assign a numeric value to a variable based on the month of a date (@td).  I'm getting /O in that variable
When debugging the processing table I get /OV when I press 'f' for field and enter @td.
Processing lines:
pe(2,.0)=mid(@td,"1","2")-"6"

The Unix system date is correct.
@dt gives me the correct date.

Any ideas why I am getting the error on @td
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.celestial.com/pipermail/filepro-list/attachments/20170413/b908cab9/attachment.html>