Try to debug the form CHECK_STATUS_TO_ORDER in LIWOLF15 as IQS1_GENERATE_DUMP doesn't provide many information, but you could put a break-point in the calling include?
Hint: In some standard programs SAP call FM like IQS1_T365_DELETE_FROM_BUFFER to refresh some buffer when calling same FM than you, did you look for OSS notes.
Regards,
Raymond