The host language SQL book can be found here. The limitations that I found do not indicate that you cannot create a module, which would indicate that it is a syntax problem. Some limitations include use of variables that begin with 'SQ', 'SQL', 'RDI', or 'DSN' as these are reserved prefixes. In addition, you must prefix all host variable with ":" and cannot use UDATE type fields, multiple dimension arrays, pointers and a whole host of other variables.
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This was first published in July 2002