purchase order error

[stevesunfold]

hi guys

i have a problem in that this purchase order works perfectly except for one very small thing i cant get my head round

it prints as it should , it saves as it should but

when the macro runs it also transfers certain cell data to sheet 2
there is not a problem if i enter a job number ie j2345 but not all purchase orders are assigned a j number
this is in cell g23:h24

if i stick to j numbers it transfers fine but if i put the word sttock into it , it causes problems on sheet 2 and i dont understand why.
if any one understands why i would appreciate it