userexit after message i152 message class V1 in tcode VA01

i have to set field vbap-fixmg = 'x' after Message i152

" Dynamic credit check has been exceeded & & "

in sales order processing tcode VA01.

is there any userexit after this message

otherwise in which userexit i can set field

vbap-fixmg = 'x' in VA01.

urgent

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