Solution : https://service.sap.com/sap/support/notes/1943239 (SAP Service marketplace login required)
Summary : 
      Due to changes in Polish law effective from January 1, 2014, the VAT date validation in SAP systems must be adjusted to meet local requirements. This entails adding checks for the Tax Reporting Date in transactions without a purchase order (VAT date must not precede the document date by more than 45 days) and for transactions with a purchase order (VAT date must be between the planned delivery date minus 30 days and the 15th day of the following month after delivery). SAP recommends implementing the changes via a Support Package using Note Assistant, especially for earlier solutions where immediate compliance is needed.
Key words : 
subsequentsap_appl600600 602602 603603 604604 605605 606606 616616 sap_fin617617  correction instructions correction instructionssoftware componentvalid fromvalid tonumbersap_fin6176171696180sap_appl6006031663769sap_appl6046041696146sap_appl6056051696147sap_appl6066061696148sap_appl6166161696179 support packages & patches support packagessoftware componentreleasesupport packagesap_fin617sapk-61704insapfinsap_appl600sapkh60026602sapkh60216603sapkh60315604sapkh60415605sapkh60512606sapkh60611616sapkh61606 references, customer component xx-csc-pl-fi financial accounting priority correction, medium priority category legal change validity software componentfrom rel, planned delivery - 30 days andthe 15th day, sales/purchases -> basic settings -> define, ue directive implementation 2040237   delivery confirmation, __%pdfstyle%__ / } symptom due, -> financial accounting global settings, / __%pdfstyle%__font-size, terms tax reporting date
Related Notes : 
       
| 1232484 | How to use the VAT due date, tax reporting date VATDATE | 
| 1931772 | 2014 VAT law changes, UE directive implementation | 
| 2040237 |