| Credit lower than expected | Credit relevance not defined, or inbound CST that does not generate credit | Relevance by CFOP and item CST | Fix the rule at the source and reprocess the month |
| Credit with no support in the file | M100 reported without the documents that support it in blocks A, C, D and F | Block M registers edited in the PVA | Generate the calculation from the blocks and review adjustments |
| Shared-CST base at zero | Direct apportionment method without editing M105 | Field IND_APRO_CRED of 0110 | Adopt apportionment or fill in M105 from cost accounting |
| Apportionment without 0111 | Proportional method without monthly gross revenue | Gross revenue by type in the month | Generate 0111 from the revenue report |
| Energy or freight invoice in C170 | Document posted in the wrong register | Classification at entry | Post in the specific blocks C and D |
| Withholding that does not match | M200 with no match in F600 | Accounts receivable withholdings | Report F600 and M200 from the same source |
| Earlier-period credit used in excess | Sum of credits deducted above the contribution of the period | Balance of 1100 and 1500 | Reconcile the balance and adjust the deduction |
| Credit forgotten in the month of origin | Included in another month, not by amending the period | Document competence period | Amend the month of origin |
| File rejected for structure | File per establishment or supplementary file | File generation | Generate one single file at the head office and replace it in full |
| Old nature code | External table updated by the tax authority | Nature and suspension mapping | Update the mapping, for example from code 405 to 904 |
| CST changed because of LC 224 | CST switched to reflect the benefit reduction | CST determination rule | Keep the original CST and use adjustments M220 and M620 |
| M210 with no register for the adjustment | Contribution register 01 or 51 missing | Block M adjustments | Create M210 or M610 manually |