Hi Chris,
I'm not sure if you're still getting this error message or have resolved the issue and have not updated.
I had the same issue and this was caused by an orphaned record in the SVC30701 table.
You can run the following SQL Script to find out which Item Number is causing it.
select SVC30701.ORDDOCID, SVC30701.ITEMNMBR, SVC30701.LNSEQNBR, IV00101.DECPLCUR
from SVC30701 left join IV00101 on IV00101.ITEMNMBR = SVC30701.ITEMNMBR
where IV00101.ITEMNMBR is null
You can either verify if the ITEMNMBR exists in the IV00101 or possibly the Service Line information has an invalid entry. Check the result of the LNSEQNBR, if the value is 0.0000 the assumption is that it is an orphan record and can be deleted.
I hope this helps the others who encounter the same issue as mine.