Table 5A of Form GST ITC-04 is intended to report the goods received back from the job worker (or received from one job worker by another job worker), and therefore the quantity should be reported based on the goods actually received back, not the quantity originally sent.
Accordingly, if 50 units of raw material are sent to the job worker and, after processing, 1 finished product is returned, Table 5A should reflect the quantity of the finished product received back (i.e., 1 unit) along with the relevant details of the challan under which the goods were originally sent.
The purpose of ITC-04 is to track the movement of goods sent for job work and their subsequent receipt or supply. Therefore, Table 4 captures the details of goods sent to the job worker, whereas Table 5A captures the details of goods received back after processing. The quantity reported in Table 5A should correspond to the nature and quantity of the goods returned by the job worker, even if the quantity differs from the inputs originally sent due to the manufacturing or processing activity undertaken.
However, as a practical matter, the principal should maintain proper records establishing the correlation between the raw materials sent and the finished goods received, including details of input-output ratios, process loss, scrap generation (if any), and job-work records, so that the movement reported in ITC-04 can be reconciled with the books of account and supporting documents.