Data objects in a Unicode program are not convertible?what does this mean?

hello,everyone,
when I execute a smartform directly in the transaction smartforms.,the result can be seen just no data.
when I execute program to transfer two internal tables from interface with data to the smartforms,and I use tcode st22,
the error is : Data objects in a Unicode program are not convertible.
the error analysis; The statement
   "MOVE src TO dst"
requires the operands "dst" and "src" to be comvertible.
the source code that error occurs is :LOOP AT I_SHIP_DETAIL INTO WA_DETAIL .
and I know that the internal table have errors ,I defined the internal table refer to a structure created myself,and I set break-point in the smartforms ,can see the data in the internal table ,so why occurs such errors ,pls help me if you know .thank you in advance.

hi
good
go through this link
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/f2dac69e-0e01-0010-e2b6-81c1e8e5ce50
thanks
mrutyun^

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