Hey Maria Kosenko,
try zero padding the batch field.
Instead of goodsmvt_item-vendrbatch = '5555' try goodsmvt_item-vendrbatch = '0000005555'
OR you can use the FM 'CONVERSION_EXIT_ALPHA_INPUT'
for example,
Types : v_vendor type LIFNR.
v_vendor = '1002'.
call function 'CONVERSION_EXIT_ALPHA_INPUT'
exporting
input = v_vendor
importing
output = v_vendor.
_______________________________________________
Output
v_vendor = '0000001002'.