YOu cant write function module in Script, But you can achieve using the external subroutines where you will be calling the program. Here you can write the fucntion module.
But if you use smartform you can write the function modules in smartform.
You may want to take a look at the rules of engagement for some ideas on how to get the best from this forum.
As your question relates to SAPscript you will get better answers posting in Expert Forums » ABAP Development » Form Printing.
You will also find if you search that forum you will find information on how to call subroutines from SAPscript, which is the approach you'll need to use to call a function module.
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