@CREATEBLOCK function not creating blocks

@CREATEBLOCK

Summary

Trying to use the @CREATEBLOCK function to create blocks, but it isn't doing it.

Content

I've used this function a number of times. I recall that sometimes it has not created blocks, like this time, but I know that other times it works fine. Does anyone know of circumstances under which it won't create a block?

Code Snippet

FIX ("Year", "Version", @RELATIVE("Total_Project",0))
    FIX("Scenario1", "BegBalance", "DSYLRP_Dist", "Multi_Undist", "BCR902", "BCR903")
        "OtherNonLbr" (
        IF("Scenario2"->"BegBalance"->"NoCostElement"->"NoBCR"->"DSYLRP_Dist" <> #missing)
            @CREATEBLOCK("DSYLRP_Dist"->"BCR902");
            "Account"->"DSYLRP_Dist"->"BCR902" = 12345;
        ENDIF
        IF("Scenario2"->"BegBalance"->"NoCostElement"->"NoBCR"->"Multi_Undist" <> #missing)
            @CREATEBLOCK("Multi_Undist"->"BCR903");
            "Account"->"Multi_Undist"->"BCR903"