How to show message with ‘E’ type and dont block screen?

Hi, experts. I’ve got a message at migo t-code class ‘IF_EX_MB_MIGO_BADI~LINE_MODIFY’.
here i’m printing an error messages, deppending on inputed values.

I need to print  an message with ‘E’ type which willn’t block the screen, and would block the post.
how to do it?

(‘W’ type of message doesn’t block the post)

 

 

 

 

IF SY-TCODE = ‘MIGO’ AND ( CS_GOITEM-BWART = ‘Y15’ or CS_GOITEM-BWART = ‘919’) and CS_GOITEM-BWTAR = ‘2100’.
clear zbesk.
SELECT SINGLE ZBESK INTO ZBESK FROM MARA WHERE MATNR = CS_GOITEM-MATNR
if zbesk eq ‘E’ or zbesk eq ‘T’.
MESSAGE ‘ Материал является покупным. Вид оценки 2100 недопустим ‘ TYPE ‘E’ DISPLAY LIKE ‘A’.
endif.
ENDIF.