there is no localisation for Bulgaria at present for SAP Business One.
All supported localisations are tailor-made for that particular country with respect to legal conformity & reporting.
Please the the [product availability matrix |https://websmp203.sap-ag.de/~form/sapnet?_SHORTKEY=01100035870000707558&_SCENARIO=01100035870000000183&_ADDINC=011000358700001192682007E&]on the SMP.
'Countries without Localized Version
In specific situations, upon signature of an extra contract by our partner, it is possible to sell and ship SAP Business One in a country or region for which no localized version is available.
Note: SAP does not offer any specific support to make sure that the standard SAP Business One version fits the needs of the countries for which no localized version is available. Also, there is no commitment from SAP to provide such support in the future.
Please contact your local Channel manager if you would like to sell SAP Business One in a country for which no localized version is available.
In order to give you an idea of the potential market, the following table lists countries without localized version, and the corresponding country versions that are being shipped and used today. In many of these countries, a local best practice solution element is available on top of the standard SAP Business One.
Local partners are implanted in all these countries, whose business is selling, implementing and supporting SAP Business One. As an SAP Business One partner, if you have a sales opportunity in a country outside of your territory, you need to work together with a local partner to make sure that local knowledge and local solution elements are used, which will ensure a successful project.'
Bulgaria is not included in that list.
All the best,