Our recent neutron scattering studies on SrMn1-xWXO3 exhibit rich structural and magnetic phases ranging from incommensurate charge (ICDW) and spin (ISDW) density wave modulations. The ISDW structure obtained from magnetic peak refinement of the neutron data exhibit moments approaching effectively even to zero. This indicates that ISDW structure arise either due to spatially modulated frustration of frozen-moments or due to spatially modulated fast local fluctuation of moments. These two cases can be distinguished through inelastic neutron scattering experiments. The occurrence of scattered intensity at finite value of energy-transfer in E-Q space will confirm the dynamic nature of the spin-moments. On the contrary, absence of scattered intensity at finite energy transfer in the E-Q space will confirm the frustration based ISDW structure.