Will this be correct if I say: Cost of sales account net effect adjustment%/Recommended adjustment =R6 304.08(from drawings) - R1 002.44 (from stationery in cashbook payments journal amount under-cast)

Your proposed calculation is incorrect because it combines two separate adjustments and uses the wrong amount for the drawings.

Here's why:

1. Drawings Adjustment: The adjustment for drawings affecting the Cost of Sales account should be the cost price of the goods, not the selling price including VAT (R6 304.08). As calculated previously, the cost price was R5 481.81.
2. Stationery Undercast: The R1 002.44 related to stationery is a separate error. An undercast in the cashbook payments journal for stationery would typically affect the Stationery expense account and the Bank account, not the Cost of Sales account. These are distinct errors requiring separate corrections.

Each error needs to be corrected individually to the specific accounts it affects. The adjustment for the Cost of Sales account, based only on the drawings error, remains a credit of R5 481.81.