Throwing Error: Argument '_number' is incompatible with the required type.

[S.Kuskov]

http://msdn.microsoft.com/en-us/libr...(v=ax.50).aspx
Check your second parameters.

P.S.: It's no good idea to place this code in forms method...

[pawan]

So can you please what should i have to do???

[S.Kuskov]

Цитата:

Сообщение от pawan

So can you please what should i have to do???

You must send in PurchFormLetter_Invoice.update() Invoice Number value as second parameter