SAP Workflow not triggering due to "Start Condition return FALSE" message in SWEL

Hi,

I have SES approval workflow which is not triggering in few cases because of check function ends with exception even it has valid start condition and correct data. For example lets say we have PO no. 100 for which 3 SES (SES1,SES2 & SES3) are created. Out of which workflow for SES3 is not triggering even if all the three contain valid start condition(Bases on internal order at PO line item).when triggering workflow manually using SWUE for SES3 it work fine.Please find SWEL screenshot below and let me know if you have come across this type of issue.

Thanks in Advance.

Ishant.