forecast of nan(series,0) with AR model

[minijim]

Hi,

I'd like to make a forecast for a given series y, which contains some NA values.
I don't want to substitute these NA values with 0 in the series, but I thought that i could use @nan(y,0) instead of y. Then I perform a AR(1) model, as follows :

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equation eq.ls @nan(y,0) c ar(1)

The estimation output seems to be ok. Nevertheless, when I try to make a forecast of this equation,

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eq.forecast yf

the following error message appears : "Unable to compute due to missing data".

Could anyone tell me where my mistake is or what is the cause for this message ?
Thanks in advance