Solution : https://service.sap.com/sap/support/notes/1022342 (SAP Service marketplace login required)
Key words : 
type            global_variable_present returning type            boole_d 3, co_gl_var_present_chk   ' '            co_gl_var_present_true  'x'            co_gl_var_present_false ' ', create instance method is_gl_var_present, parameter type typing method, live parameter reason, call transaction se24, open class cl_symboltable_poc, methods tab page, instance attribute m_global_var_present, attributes tab page
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