Activation errors while extending Material number length in BW

Hello Experts,

Our lawsuit is upgrading their ECC to S/4HANA and successful the process enabled the extended worldly fig functionality successful S/4HANA. The worldly fig magnitude is present extended to CHAR 40.

As a result, the worldly magnitude request to beryllium extended to CHAR 40 successful SAP BW strategy to lucifer with S/4HANA worldly length. We are doing a PoC successful BW sandbox and followed the process mentioned in SAP Note 2422224, Scenario 2 (<= 40 CHAR) to extend  0MATERIAL magnitude successful BW environment. Our BW is connected mentation 750, SP 25.  As per the note, the anterior measurement is completed of maintaining array RSTMCNV successful BW with aforesaid introduction arsenic array TMCNV successful S/4HANA. 

Next measurement we effort to alteration the 0MATERIAL magnitude from 18 to 40 and conversion exit from MATN1 to MATNB. While trying to activate the infoobject we are encountering tons of errors with structural alteration astatine tract level for babelike tables arsenic below. It shows astir 197 tables person structural interaction astatine tract and request conversion, moreover 0MATERIAL is not getting activated. If we set the array operation via SE14 the worldly tract is going backmost to CHAR 18.

Structure alteration astatine tract level (convert array xxxxxxxx)

Can you delight counsel if anyone has successfully capable to execute the 0MATERIAL magnitude changed to 40 with information disposable successful the BW system. Please suggest immoderate champion attack to travel to person worldly magnitude successful BW for this scenario.

Thanks