Solution : https://service.sap.com/sap/support/notes/487724 (SAP Service marketplace login required)
Key words : 
= ptxtpatt function module = dg50_getsymb_default_textpatt 5, copy module dg50_getsymb_dgcldcbl, environment parameter dg_paper_default_textpattern, ppppppppppppppp = phrase key 4, dangerous goods master, attached advance correction, form cccc-ppppppppppppppp, dangerous goods documents, define processing conditions, default text pattern
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