Shift Allowance become prorate if the Action (Info type 0000) in the same month have changes. (Depand the action type) shift allowance amount 300

Hi,

Please help me to solve this issue

My client requirement is

(currently shift allowance are maintain through wage type  in info type 15 )

Shift Allowance become prorate if the Action (Info type 0000)  in the same month have changes. (Depand the action type) shift allowance amount 300

Actions are

WA,WB,WC,WD,WE,WF,WG,WH,WI,WJ,WK,WL,WM,WN,WO,WP

XO,X1,X2,X3,X4,X5,X6,X7,X8,X9.

XA,XB,XC,XD,XE,XF,XG,XH,XI,XJ,XK,XL,XM,XN,XP,XQ,XR,XS,XT,XW,XX,XY,XZ.

Y0,Y1,Y2,Y3,Y4,Y5,Y6,Y7

YA,YB,YC,YD,YE,YF,YG,YH,YI,YJ,YK,YL,YM,YN,YP,YQ,YU,YV,YW,YX,YY,YZ

Z9,ZY

Thank you

Raamarao