Hi bookkeeper60,
You will find that the supplier bills that appear on your VAT Boxes 1 and 6 have one of the EC codes for services rendered from EU countries (zero or 20%) or Reverse Charge (RC). They should also appear on Boxes 4 and 7 to contra out.
If the business have actually bought physical goods from the EU, then the correct VAT codes are 20%ECG or 0%ECG depending on the category of goods. In which case, they will show up on Boxes 2, 4, 7 and 9.
I have not seen the exact EC VAT codes you described, but I can figure out; for example "ECPSZR" is EC purchase of services 0%. Will need to know the nature of goods or services the business has bought to pick the right code.