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This should be fairly simple. I'm trying to convert a numeric field into a string.

series FieldName = @str(CustomerNumber)
I get an error message: Can not assign string expression to numeric variable in...

The CustomerNumber is a number between 10 and 15 digits. It is also used to give structure to the series in panel data.

What could be the problem?

alpha FieldName rather than series FieldName

Thank you. That worked. But I can still solve my problem. The string is being written as scientific notation. What I'm actually trying to do is to get the last four digits:
alpha FieldName = @str(CustomerNumber)

series NewCustomer = @right(FieldName, 4)

returns = e+13

Take a look at the Help system documentation for @str. You can supply a format specification that might give you what you want.