Found an incompatibility between BG1UB and Lure of Sirine's Call: Both mods assign a script as CLASS script to Sil.cre:
BG1UB.tp2:COPY_EXISTING ~%tutu_var%SIL.CRE~ ~override~ // Sil
WRITE_EVALUATED_ASCII 0x250 ~%tutu_var%SIL~ #8 // Assigns the SIL script as Class script
BUT_ONLY_IF_IT_CHANGES
LoSC.tp2 (triggers the allegiance of the other sirines dependent on Sil's)//give Sil a script so she can call for help if attacked
COPY_EXISTING ~_sil.cre~ ~override~
WRITE_ASCII 0x250 ~J#sirin0~ #8
Since I am preparing an ubdate for BG1UB, would it hurt to assign the "sil.bcs" as "GENERAL" script instead (This script slot is still free in sil.cre)?