Hi,
You have 200 receipts for different invoices from different vendors that need to be created in SAP.
Why you are creating service entry sheet (ML81N) after receiving different invoices from vendors- you should create service entry sheet (ML81N) after required service is completed and release service entry sheet once vendor service entry sheet recognized.
If require by business- you keep all data required for service entry sheet and post all service entry sheet (ML81N) with help of BAPI. Discuss with technical consultant how BAPI can be used to post service entry sheet ML81N from a required file.
Regards,
Biju K